Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc4acde9afeb60c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-21 22:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ea476c4a6ee6c5cdc1fa69d6431710 SHA-1: 57491688dfee617489e2dd56e9a5e60502181053 SHA-256: 6bc4acde9afeb60c30a6a617dda53127acce92d5c2c6b66b693976a4adb85ff7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'weight loss percentage calculator excel template'. The document body also contains this lure text and numerous embedded URLs, many pointing to Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=weight+loss+percentage+calculator+excel+template
    • http://files.velmavonbonbon.com/uploads/1/3/0/7/130738765/muwobovikofot.pdf
    • http://files.smallberrygreen.com/uploads/1/3/1/3/131398356/bexalir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/21619703456.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7977/files/71429326578.pdf
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/80284292009.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/12840759351.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/set_theory_theorems_proofs.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/81962166806.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/5881857893.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/koninklijke_ahold_delhaize_nv_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/cambridge_igcse_geography_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/tiwizuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/lanurijagupetizevogaton.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/junujixesugep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/derel.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_off00006863.bin
a7a011adda13799827a8d28de618d686c2652a74be2f5380d34cd199a9a72682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6863 5308 bytes
font_01_sfnt_off00007a5a.bin
0e83a63ec34e090b062914981c2465b06acfeba4673443d6c754190c8cdcbdec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 10476 bytes
font_02_sfnt_off00009e31.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 4324 bytes

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