Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290b8b3631ca5ef…

MALICIOUS

PDF

46.7 KB Created: 2020-07-22 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: cd6fabd3c179e4358cfdd4f0984845c6 SHA-1: e04461f6538107db280f24a9f30d144dc78d75b8 SHA-256: 8290b8b3631ca5ef7c45a7374e4e9bbd808f7d5d2ca38cd0d6d49d9bcea83bc7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc', which is likely used to funnel victims to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the extensive use of external links and redirectors suggests an attempt to lead users to malicious sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=fractura%20de%20cadera%20traumatologia%20pdf In PDF document text
    • http://files.mmeramirez.com/uploads/1/3/0/9/130969655/matodikajusuze-dabidox-kosaluzikeso-vanejamedopezug.pdfIn PDF document text
    • http://files.befitforhealth.com/uploads/1/3/1/1/131164383/4740807.pdfIn PDF document text
    • http://files.kingsporthorses.com/uploads/1/3/1/3/131383553/1742861.pdfIn PDF document text
    • http://files.advancedmodularmanikin.com/uploads/1/3/1/8/131856353/b322085aedb061c.pdfIn PDF document text
    • http://files.thinkingwithcrystal.com/uploads/1/3/1/0/131070762/vasikasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muzaloxebomasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/57395631616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/45891301022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faramerujinusopuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/50839239327.pdfIn PDF document text
    • https://ragetefuka.files.wordpress.com/2020/07/paloki.pdfIn PDF document text
    • https://lapojiruvapo.files.wordpress.com/2020/07/zalodu.pdfIn PDF document text
    • https://kuduwefego.files.wordpress.com/2020/07/mavoriduxikomudijasane.pdfIn PDF document text
    • https://rizizesul.files.wordpress.com/2020/07/87395991861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/lolizisifokenirozugadifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/joder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/75463920652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/87530303441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/81989125983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/dozuroxofopotazelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/pexumuzobive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/gubodo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 5028 bytes
SHA-256: f58dc88fa61c5e47fbd391d44cf4e0d9c3f51354df6e9423ae93d715337438a9
font_01_sfnt_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 11012 bytes
SHA-256: 5f22c975c80667764d51998d2fb83025e67f37b2c79c498001408d3c573e360c