Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bf3c6df6506ef7…

MALICIOUS

PDF

46.7 KB Created: 2020-08-08 17:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb90a5f3802b7c142e2117c8c8094590 SHA-1: 863b02e067e9b1eef4cb10215f9f3cc90b9947d2 SHA-256: c5bf3c6df6506ef728f836865d2490d8c5cafe48cc2914217a6809c6eecbacc2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is presented in the document body, disguised as a link to 'Pdf astronomy for dummies'. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=pdf+astronomy+for+dummies
    • http://sulelemu.thewanderers.org.au/uploads/1/3/1/8/131856772/9079627.pdf
    • http://files.johnmorganpoet.com/uploads/1/3/1/4/131453681/muzaragugu-zupuponogux-lidisoxij-kisabi.pdf
    • http://files.mustangsbasketball.com/uploads/1/3/1/4/131407918/sezemafegaj-nederidizan.pdf
    • http://files.scibridge.org/uploads/1/3/0/7/130739656/jizapu.pdf
    • http://files.charmsandsparklebyria.com/uploads/1/3/2/8/132814949/lifejegovaxedov_donisusovufibed_dibadelak.pdf
    • http://files.mustangsbasketball.com/uploads/1/3/1/4/131407918/se
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/55562267612.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/arraylist_big_o.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/lelomovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/remove_key_from_dict_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/4804/1637/files/58795005965.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/miwodoriti.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/lekivobodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9378/files/minecraft_instant_structures_mod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/5780654870.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/folikonevodavet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7369/files/consumer_reports_coffee_makers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/55851344496.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/koxewojurijugelu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/33519934783.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/82835809651.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_off00007926.bin
e3cd9d1857532180c9a29d470c8204d12b273f611724dd9db4b10f59c954ddc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7926 5124 bytes
font_01_sfnt_off00008a88.bin
935e6e2b55ca77b25b7fce8cf87b8f80412daa36fac36f5a615e3e337d988886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A88 10192 bytes

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