Malicious PDF — malware analysis report

Static analysis result for SHA-256 b809e148d584c56f…

MALICIOUS

PDF

50.9 KB Created: 2020-08-12 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234c0b048b1c194d04684d8e8d789616 SHA-1: dba6513ee323f3712244797035e072475f175a53 SHA-256: b809e148d584c56f0eade401a537e10e34be5176a1c32ab13be036d542877f80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests the document is designed as a link farm to distribute traffic to malicious sites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=reading+list+template+pdf
    • http://files.manisteecd2.org/uploads/1/3/1/6/131606546/wukonawopepevesise.pdf
    • http://files.markbury.com/uploads/1/3/1/8/131871871/fezafudidaw_kimetulasupuda_kajejobowi_jugamikudolitev.pdf
    • http://files.turncoatmenswear.com/uploads/1/3/0/7/130776230/bufobikubusejigugiwe.pdf
    • http://xilezejid.jennuinenhphotography.com/uploads/1/3/0/7/130775795/gubaporuxib_fomotuwodibid_jusepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/rewuxaxotakotan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/pajojikivapexusox.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6808/files/lotugure.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/western_blot_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/45505684006.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/accounts_assistant_resume.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/vimipokete.pdf
    • https://cdn.shopify.com/s/files/1/0432/3465/6423/files/mupapisudegowetukaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/biological_oxygen_demand.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/62953109991.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/bcom_1st_year_financial_accounting_question_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/4913723376.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/2427263128.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1880/files/conductive_materials.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_off00008937.bin
72b562d43f40d4405d9ab2dcb8093eda3dc0d7620fd0da263161302f7f907900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8937 5272 bytes
font_01_sfnt_off00009b1d.bin
4d299d71627331331a2da92a8a5047be515dd9398f6c3fa161d036807f78db47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1D 10436 bytes

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