Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4b2331d43ccdff…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 07:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9bc24ecbf02e240794d9dec3a69c7a0 SHA-1: b51d0d8780ea7dbb8cb297be66bf6d71c820dda8 SHA-256: 3b4b2331d43ccdff87f21bdf74a07212f1e847daa775e501cb6bb993580da740
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/wix?keyword=current+affairs+august+2019+pdf+free. Additionally, the document exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, reinforcing the lure to download content.

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.com/wix?keyword=current+affairs+august+2019+pdf+free
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/megogoto.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/97721658035.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8161/files/d_d_guide_to_ravnica_classes.pdf
    • https://static.usrfiles.com/ugd/e3ff21_ec8bec7d136745028c8833894f9df38d.pdf
    • https://static.usrfiles.com/ugd/fbccce_ad367c3511864f9ca0b749f42e259a9d.pdf
    • https://static.usrfiles.com/ugd/4479ed_8d287a735429408188436ece4f6c1232.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_69edc50eec0c43e595fb7d8f78420436.pdf
    • https://static.usrfiles.com/ugd/77d535_19b97744469243819d40071fdfe9122c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/bezirasofagogarugorikol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/chemical_engineering_coulson_and_richardson_3rd_volume.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/autocad_3d_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/jokuxixixabasovumanegujav.pdf
    • https://cdn.shopify.com/s/files/1/0434/3421/3538/files/constant_velocity_worksheet_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/traditional_bowyer_s_bible_volume_2.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_off000060d6.bin
c6dc1ca1bb8bc8f81120bb5099329bb8ced9b79634fbde32783b4f4a2b0c868f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 5564 bytes
font_01_sfnt_off000073d1.bin
a226f70e88f5459be5b4bec60b38637daedb0a4d1516ae2461795b8b492a30cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10584 bytes

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