Malicious PDF — malware analysis report

Static analysis result for SHA-256 4930cc98f818f82d…

MALICIOUS

PDF

44.0 KB Created: 2020-08-03 16:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321093e9b548eaf599f5c3711b3d98bd SHA-1: e61f17c5fd9f0f24414dbe0abb8468007400ce96 SHA-256: 4930cc98f818f82d020567ebff03a196a9b9b794cfb543eb7f99951383d47bb8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on Shopify. One of these URLs, https://ttraff.com/pify?keyword=hiv+and+aids+prevention+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be a garbled attempt to disguise the content, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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/pify?keyword=hiv+and+aids+prevention+pdf
    • http://files.kelleyintegrity.com/uploads/1/3/1/4/131483372/xovexogu.pdf
    • http://files.pancreaticalliance.org/uploads/1/3/1/4/131437064/jesewasavugapege.pdf
    • http://files.thehillchristianfellowship.com/uploads/1/3/1/3/131381553/0e1518b285c.pdf
    • http://files.mylunarsign.com/uploads/1/3/1/8/131857482/6fcae3.pdf
    • http://files.torrainewalker.com/uploads/1/3/0/8/130874683/fonozezaraw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/29620931776.pdf
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/fallout_4_perks_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/zamawufil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/692488547.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/51411932047.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/rimomepusupepip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89352644259.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7792/files/cub_cadet_repair_manual_for_snow_thrower.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/p2p_magic_training_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/gejafituwizobuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2697/9739/files/73031517741.pdf
    • https://cdn.shopify.com/s/files/1/0440/9524/2392/files/wajaruganokojuwixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/gotokuxebiteku.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_off0000701d.bin
f7032bdac7a849376850c565845b78a4e8bc423e92cf995b20936043b04a18b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 5024 bytes
font_01_sfnt_off00008148.bin
a398493334c768c40cf298af7da5660658a9ea799f175377657a2d1827758862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 9860 bytes

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