Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46ea597a6de5ba0…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ed208fe5bab918a0c5333d9289d1b44 SHA-1: 77f3d650b76fe674ce3f5918873101af5723e744 SHA-256: a46ea597a6de5ba0ab8c762ac79e3ecfbd4cb0825c1e2090f9e1982943be7900
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=coding%20decoding%20pdf%20for%20bank%20po'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The primary attack pattern involves luring the user to click on these links.

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=coding%20decoding%20pdf%20for%20bank%20po
    • http://files.jiacui-li.com/uploads/1/3/1/6/131637014/418d10beb.pdf
    • http://files.dullesprograd.org/uploads/1/3/1/3/131383045/jogozokuvo-zofakalesevubun-pirinez-xefejulovazekax.pdf
    • http://files.evasvillage.org/uploads/1/3/0/7/130775897/jogedovopo_xuxezelezif.pdf
    • http://befel.lacymitcham.com/uploads/1/3/0/7/130775087/6921d5e9.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/gejosideguxedigisabej.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3555/files/fobogikexem.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/article_about_educational_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/vajifuzezunebulojijugi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/subixesezegapev.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/wisifufaxotoniwomuso.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/gudimopuzizedufojifikifi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/37142750840.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/monster_blood_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/52944191568.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/kmart_east_brunswick.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067dd.bin
e5f70f8ea450292561c887fbcf6c88b4ed91be198b8817f8abc674a5b46a651f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DD 5224 bytes
font_01_sfnt_off000079ad.bin
f1edb80589d9187c863fed2400e5e5e12c74753d2271c0ff719d82e4c0cdfe30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AD 14284 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.