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)
MD5: 8ab16d1b84fe2fcd397c6fc45b156b87 SHA-1: 14dfdf7721c39821cf54b16d597534371056e385 SHA-256: 5ecea1f3619416df685e97f68e431c9b568d077789487b4128e4be0a8387c65a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, masquerading as academic syllabi, which are designed to redirect users to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a redirector link further supports this assessment. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.tatrafarm.com/uploads/1/3/0/7/130739740/pamamiriro.pdf
    • http://files.nyharbornature.com/uploads/1/3/0/7/130776561/6268370.pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdf
    • http://files.oahuleis.com/uploads/1/3/1/4/131406735/zelajidar-zilarobi.pdf
    • http://files.pro-style-fitness.com/uploads/1/3/1/6/131607889/5715825.pdf
    • http://files.lldrq.com/uploads/1/3/0/7/130776247/ada4b65faec44e8.pdf
    • http://files.mekongelephantpark.com/uploads/1/3/0/7/130740618/6739530.pdf
    • http://files.josie-johnson.com/uploads/1/3/1/6/131606674/tazenagamol-guzixadakufe-juwixuzeno.pdf
    • http://files.a-moment.me/uploads/1/3/1/6/131606640/benujopege-fewuvisu-ripekowukemat-pojesobav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://magejawaj.files.wordpress.com/2020/07/dakemajetuxedagavosutig.pdf
    • https://dukugakux.files.wordpress.com/2020/06/wikogojoj.pdf
    • https://mubamijev.files.wordpress.com/2020/06/kovuwi.pdf
    • https://namuvese.files.wordpress.com/2020/07/17798994983.pdf
    • https://sobupex.files.wordpress.com/2020/06/tisiseravisomepufowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25781613666.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000776a.bin
bfd8de6dfadd96ced42aa2d79f5c4bd8b98b1d69aaf1c21b65980aee1364de74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 5496 bytes
font_01_sfnt_off000089f0.bin
323c437a388bb7dc23d19b4d1e499236b6fb643214fea2f508a036b0c5ca52cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F0 10668 bytes

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