Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9cb7294d5fc6be…

MALICIOUS

PDF

52.1 KB Created: 2020-08-08 19:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73394786d37c1ca35ecad4e8b5d84194 SHA-1: fdb4b70bccef66d2daaba4c579774d77c20a806e SHA-256: 0f9cb7294d5fc6bee274007c03293fe15e3459681b08f8bfa7883aa028a233d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to a USPS change of address form. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links, many pointing to benign Shopify domains but some to unknown hosts, indicates a link farm strategy. No scripts were extracted, but the primary maliciousness stems from the redirector link.

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=usps+change+of+address+form+3575+pdf
    • http://files.mbcnavarino.org/uploads/1/3/1/4/131407194/leruvufupusedep.pdf
    • http://wizafa.theremnantknoxville.org/uploads/1/3/1/0/131071157/66c033a1.pdf
    • http://files.gfbc.net/uploads/1/3/0/7/130775953/3291817.pdf
    • http://files.aimvt.com/uploads/1/3/0/8/130874284/bumelaki.pdf
    • http://///www.ftc.gov
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/kagivivikugopejeminalip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/calcium_diet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/dalugarilevexonusonuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3777/files/notalomamugar.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/scrabble_game_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/eugene_bozza_badinage.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/kugidizavat.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7572/files/47477730544.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/48839730420.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/pimaluvoguworegogom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/41221452104.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/sound_files_for_stardew_valley.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d2a.bin
d3b9b094f2844df8eff939e6aebb74de5092a14d2ac4eb43b5e76becc313773e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2A 5556 bytes
font_01_sfnt_off00008fdc.bin
2e1a8d5af3a2eb9a519413d46cc1279f2ba8d4845a71a57448b0ec1e3b1c6b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDC 11008 bytes
font_02_sfnt_off0000b57f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 4324 bytes

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