Malicious PDF — malware analysis report

Static analysis result for SHA-256 00911ebed7950395…

MALICIOUS

PDF

41.2 KB Created: 2020-08-06 11:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b579e9a038ed091814ea47214ca74287 SHA-1: 628cf5eaddbc65ded631632c5b5ef13c3d2f87f8 SHA-256: 00911ebed79503954470e0b230a6e9aaa954c24a2a072b310b9bb19f65b67545
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning technique used to lure victims. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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/pify?keyword=characteristics+of+sociology+as+a+science+pdf
    • http://files.salsaritaslexky.com/uploads/1/3/1/4/131407898/9916121.pdf
    • http://files.dei-zinzfreshstudio.com/uploads/1/3/0/8/130813409/78732db4784a.pdf
    • http://files.stuartcrouch.net/uploads/1/3/2/6/132695428/4416860.pdf
    • http://files.riinamakeup.com/uploads/1/3/1/1/131163920/cfdacf022d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/tojezusezasukajabelixag.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/69963031097.pdf
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/1055620120.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/22025419230.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9383/files/1989_chevy_truck.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/24716969894.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/14563408711.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/99302894457.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/toto_catalogue_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/libebesodidafozefetifoxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1098/files/64151556926.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/75956668890.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/the_pocket_guide_to_critical_appraisal_download.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_off000061db.bin
cad9eaec38c664ee54231669f80de68a41ce31a1d853d3d620dbb359595736a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DB 5424 bytes
font_01_sfnt_off0000744a.bin
3b5f538a52f322309b97a20231759618e22e353abc6f39371ee22718e4eee802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 10420 bytes

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