Malicious PDF — malware analysis report

Static analysis result for SHA-256 f166bb3af485ae30…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 22:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8a68c3007a6cae3730e44c58248495 SHA-1: 302d7370c9f831215af79451c250acfad65169c5 SHA-256: f166bb3af485ae308f73e2ba850c754940bd9c928ff28f1de789b8d09193f5b8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous Shopify-hosted PDF links suggests an attempt to create a large, distributed content farm, likely for SEO manipulation or to host payloads. The primary malicious URL identified is https://ttraff.cc/pify?keyword=skb+ahmadiyah+pdf, which is a known redirector.

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=skb+ahmadiyah+pdf
    • http://files.cockatooparkmorgans.com/uploads/1/3/1/1/131163564/904fc7aae6d6ad.pdf
    • http://files.jamminforjaclyn.org/uploads/1/3/2/3/132303382/vakokupepufuzedivu.pdf
    • http://funubipik.clearfieldcreekwatershed.org/uploads/1/3/0/8/130813420/d9b06.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/python_string_replace_regex.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/vipizunolixafadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/paforamubejotunaxunipidut.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/fefumodudifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/52759771651.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/zerezawol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/65891807415.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/84799973185.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/vulesusitorezajetageg.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/kurafuvemobaxun.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/morgan_clinical_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/vofekewiredekowozarufag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/bukikedajotedekukafabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7525/files/git_pull_set_upstream.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_off0000641f.bin
f8118aacf03c29abc8814b61c7d4656b66365b4d37008bf56c7bb716ed5af992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 5384 bytes
font_01_sfnt_off0000765b.bin
a8fb44cd1c222eeba13424d5e53dd196ad3e96cae88a132276265b743b9679fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765B 9796 bytes

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