Malicious PDF — malware analysis report

Static analysis result for SHA-256 0752681d8e97c34f…

MALICIOUS

PDF

52.2 KB Created: 2020-08-09 14:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef4f008f3f5d86ecce8120ce2daee44 SHA-1: f3edb482cc2114d293351c212c1da3ea3aaa859e SHA-256: 0752681d8e97c34fbcae068193a15877bcf226edc0a93444239d4a2fadf71821
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body and embedded links suggest a lure to download further content, potentially leading to malware or phishing.

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=the+ants+go+marching+sheet+music+pdf
    • http://files.schoolrockspartybox.org/uploads/1/3/1/3/131383743/jejoz-fimaju-wuzajozidusovi-wonizanuligozoz.pdf
    • http://files.pressplaycommunications.net/uploads/1/3/1/3/131379325/worazimilaguxi.pdf
    • http://files.triplehranch.org/uploads/1/3/2/8/132814355/2996354.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/sage_pastel_accounting_training.pdf
    • https://cdn.shopify.com/s/files/1/0429/4583/9271/files/adding_text_to_a_document_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/79302196025.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3283/files/24256907973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9801/1816/files/57766475203.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/57840347720.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/xikiwasuwurejegusapiraxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62374455636.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/takimomugagirukalotonamid.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/wewuwelamemebebeniwifimoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/keporojobuvotaxunomafipuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8757/files/wutad.pdf
    • https://cdn.shopify.com/s/files/1/0438/7163/3563/files/whirlpool_top_load_washer_repair_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b88.bin
dda0f2a30f2df6b5a647102a964f5d0db5378e1284997fe43bb997af3258773b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 5368 bytes
font_01_sfnt_off00007d90.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D90 1800 bytes
font_02_sfnt_off0000861e.bin
2370a256b9b936481dc9db51494b0da4e3f406717c98711ba731c446af1e693b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861E 15096 bytes
font_03_sfnt_off0000b538.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 4324 bytes

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