Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecea1f3619416df…

MALICIOUS

PDF

46.8 KB Created: 2020-07-09 22:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 8ab16d1b84fe2fcd397c6fc45b156b87 SHA-1: 14dfdf7721c39821cf54b16d597534371056e385 SHA-256: 5ecea1f3619416df685e97f68e431c9b568d077789487b4128e4be0a8387c65a
194 Risk Score

Malware Insights

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

This PDF document contains numerous links to external sites, masquerading as academic material to trick users into clicking. The primary redirector URL is identified as malicious. The document body and embedded links suggest a phishing or malware distribution scheme, likely using a link farm to obscure the final malicious destination.

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.ru/wb?keyword=kannur%20university%20ma%20english%20syllabus%20pdf In PDF document text
    • http://files.tatrafarm.com/uploads/1/3/0/7/130739740/pamamiriro.pdfIn PDF document text
    • http://files.nyharbornature.com/uploads/1/3/0/7/130776561/6268370.pdfIn PDF document text
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdfIn PDF document text
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdfIn PDF document text
    • http://files.oahuleis.com/uploads/1/3/1/4/131406735/zelajidar-zilarobi.pdfIn PDF document text
    • http://files.pro-style-fitness.com/uploads/1/3/1/6/131607889/5715825.pdfIn PDF document text
    • http://files.lldrq.com/uploads/1/3/0/7/130776247/ada4b65faec44e8.pdfIn PDF document text
    • http://files.mekongelephantpark.com/uploads/1/3/0/7/130740618/6739530.pdfIn PDF document text
    • http://files.josie-johnson.com/uploads/1/3/1/6/131606674/tazenagamol-guzixadakufe-juwixuzeno.pdfIn PDF document text
    • http://files.a-moment.me/uploads/1/3/1/6/131606640/benujopege-fewuvisu-ripekowukemat-pojesobav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://magejawaj.files.wordpress.com/2020/07/dakemajetuxedagavosutig.pdfIn PDF document text
    • https://dukugakux.files.wordpress.com/2020/06/wikogojoj.pdfIn PDF document text
    • https://mubamijev.files.wordpress.com/2020/06/kovuwi.pdfIn PDF document text
    • https://namuvese.files.wordpress.com/2020/07/17798994983.pdfIn PDF document text
    • https://sobupex.files.wordpress.com/2020/06/tisiseravisomepufowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25781613666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.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_off0000776a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 5496 bytes
SHA-256: bfd8de6dfadd96ced42aa2d79f5c4bd8b98b1d69aaf1c21b65980aee1364de74
font_01_sfnt_off000089f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F0 10668 bytes
SHA-256: 323c437a388bb7dc23d19b4d1e499236b6fb643214fea2f508a036b0c5ca52cf