Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bb2de69cb94600…

MALICIOUS

PDF

47.4 KB Created: 2020-08-09 01:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f115f18a190c6fe2cfb583c731482b69 SHA-1: 9d0f71b6820e49d69a28364b18d4f8b496b167e3 SHA-256: 81bb2de69cb946008bcd90202e2993fc66afb0d7fccc3afc152d26d96f2d02ac
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=franchising+definition+pdf`. This link is presented within the document body, suggesting a social engineering attempt to trick the user into clicking it. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=franchising+definition+pdf
    • http://wojevot.iamplurilingual.com/uploads/1/3/2/3/132302921/fofizunivijebi.pdf
    • http://files.daniellamoffsonfoundation.com/uploads/1/3/2/7/132740435/da3b4.pdf
    • http://files.victorxp.com/uploads/1/3/0/9/130969424/1453534.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/76677596416.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/capacitors_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0440/0244/3422/files/80870218898.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/pdf_file_supported_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/sifuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/53653904206.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/jack_black_soundboard.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/japakobefupomowapepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/62929523802.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/dovogovage.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/bajosuvufokivazekofibarap.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_off00006f07.bin
259cbff4d0cf87119030bed4822282eb3dd63442401d988f0682c28ac7e02f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F07 5128 bytes
font_01_sfnt_off00008062.bin
8e3e23766637d1acb054a025640ca3d5a0aa4a15372d1f529acc43f5314b0a97
pdf-font-stream PDF embedded font (sfnt) at offset 0x8062 10096 bytes
font_02_sfnt_off0000a2f1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F1 4324 bytes