Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1835fade5393e9…

MALICIOUS

PDF

62.0 KB Created: 2020-07-15 14:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: bfad438c3ae18b965cf8d96e6b19fd38 SHA-1: 9c3d38771111a5545d8a730a74925d8defd7c8a9 SHA-256: 1e1835fade5393e9f1251c453d314f3113abe7c3602b7328a754b80f63a08128
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wb?keyword=activated%20carbon%20journal%20pdf'. Another critical heuristic indicates a PDF link farm, suggesting a large-scale distribution effort. The ML classifier strongly supports the malicious nature of the document. No scripts were extracted, but the primary attack vector appears to be luring users to malicious external sites via deceptive links within the PDF.

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.com/wb?keyword=activated%20carbon%20journal%20pdf In PDF document text
    • http://files.thirstforknowledge.ca/uploads/1/3/1/0/131070173/afdff8cc.pdfIn PDF document text
    • http://files.connectivityusa.net/uploads/1/3/1/6/131606454/8656316.pdfIn PDF document text
    • http://files.urbanafineartscenter.com/uploads/1/3/0/7/130776066/dozidezop-kapesa-vufodegemubo.pdfIn PDF document text
    • http://files.idyllwildcabins.com/uploads/1/3/0/7/130740217/dojopezeluguwapi.pdfIn PDF document text
    • http://files.100ways.org/uploads/1/3/0/9/130969048/xenekab-vafumokefugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kekuxukexeni.files.wordpress.com/2020/07/86279680887.pdfIn PDF document text
    • https://tawutetamazo.files.wordpress.com/2020/06/moradujejunerixodedalun.pdfIn PDF document text
    • https://vamifawoga.files.wordpress.com/2020/07/62332795451.pdfIn PDF document text
    • https://numewim.files.wordpress.com/2020/06/balapawufamipadi.pdfIn PDF document text
    • https://kulomewa.files.wordpress.com/2020/06/90452465005.pdfIn PDF document text
    • https://tixemog.files.wordpress.com/2020/06/70013415920.pdfIn PDF document text
    • https://mugafeg.files.wordpress.com/2020/07/godevubapulipifoj.pdfIn PDF document text
    • https://rurilaxun.files.wordpress.com/2020/06/bijemijezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/14785479577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/wixibijole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9588/3925/files/nobibujolabosanifesesimuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/dovebowunelukulepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/barisakun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/86541053499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/salane.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_off0000a925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA925 5116 bytes
SHA-256: 3f19277c64e20b5b89f914a4b927daefad532e11b242fe3016d3bafaa88a5b7a
font_01_sfnt_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 16060 bytes
SHA-256: 5caf48f8bd5ea88d8c094a3406bdda9b1676205c436e0f0cc32829b6cf44c77c