Malicious PDF — malware analysis report

Static analysis result for SHA-256 a011cbdc6d8eb63f…

MALICIOUS

PDF

45.4 KB Created: 2020-08-05 08:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e9092bc67159d22c422238773517a9 SHA-1: f6af9a5ac12dc6281128b06398c85bc6652ccbd8 SHA-256: a011cbdc6d8eb63fbda9b281b95ebd2a15b71550893c49016de32ffbe0c918ad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text referencing 'Broiler chicken weight chart pdf', suggesting a lure to entice users to click the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and visibility for the malicious content.

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=broiler+chicken+weight+chart+pdf
    • http://files.fomuchskateboards.com/uploads/1/3/2/8/132814048/jitefefisi_sanuseput_duzex_ronuv.pdf
    • http://japovu.memphisescaperooms.com/uploads/1/3/1/3/131379732/vubazerigal.pdf
    • http://files.benewahhumanesociety.org/uploads/1/3/2/6/132681384/xedad_tamixukololu_tiboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/mufaforupokufuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/kakamilagamubesamopumuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/how_to_get_your_discord_server_popular.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/43090641573.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/nuwebubifepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/76986884047.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/gabimel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/mexazilovidevasekoxitexe.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_off0000668f.bin
975f851e268437f6665aa8e2ff9b94a4a1b7fff69bf62be1a63d02b1ada07841
pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5232 bytes
font_01_sfnt_off0000785f.bin
66c956b689a8553c962c4e503c1ddefdb9d609049f03af2fb28813a7ae17c6e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 10012 bytes
font_02_sfnt_off00009abb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABB 4324 bytes