Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6c79624694bb7…

MALICIOUS

PDF

116.1 KB Created: 2020-08-04 01:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a74c97dbca10e7af56606221d901325 SHA-1: 0188e871a2003530849eb41ca9f6c2636b3b34e0 SHA-256: 88b6c79624694bb749be59ef743f4f4e38db675bffb34eff4a93dd2f52b22095
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=after+12th+science+courses+list+pcb+pdf, which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting a phishing attempt.

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=after+12th+science+courses+list+pcb+pdf
    • http://files.stephcharaska.com/uploads/1/3/0/8/130874482/3944751.pdf
    • http://files.diasalinas.org/uploads/1/3/0/7/130774979/5e8b10c9322.pdf
    • http://files.starlight-angels-ministries.org/uploads/1/3/0/7/130774990/nojonimani.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/94515809529.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/86185160197.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/xerifezekijavedes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/69682058610.pdf
    • https://cdn.shopify.com/s/files/1/0430/4463/4773/files/31568924985.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/blindness_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/73591479152.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/78403385521.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/29676404088.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/yamaha_raptor_660_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/rakivikusoxigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/anatomy_of_liver_and_biliary_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c43.bin
121e9e1bc4422aca6954a8412a3a1401bf1290719d3ad22735bdf929a66e76b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C43 5344 bytes
font_01_sfnt_off00018e76.bin
09c5f81bde8f0c85a237a4fd3325240d4ede438a9a0258054b26f612594ce03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E76 11780 bytes
font_02_sfnt_off0001b52a.bin
aca1160a9f11ec9617ef8458dde377ce97c014530ef704e5cf45a163325fd4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52A 3532 bytes

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