Malicious PDF — malware analysis report

Static analysis result for SHA-256 616fba08a4dfb4df…

MALICIOUS

PDF

43.1 KB Created: 2020-08-14 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7bb7ba31ad4f389f450cc2273d0f381 SHA-1: 6e8e73ffad87932ae9ed6e781957c147e69e0318 SHA-256: 616fba08a4dfb4df15652fe168c3f9069d0de6f6be41cc615f7ea21d853fb781
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it redirects to known malicious infrastructure via the URL https://ttraff.cc/pify?keyword=ct+anatomy+abdomen+pdf. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the redirection heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=ct+anatomy+abdomen+pdf
    • http://files.cxgreenworks.com/uploads/1/3/1/4/131438539/powonef.pdf
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdf
    • http://files.amandahudsonart.com/uploads/1/3/1/4/131406430/setisu_pojufusojivala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/zirizajot.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/tascam_dp32sd_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/mumapez.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/how_to_make_pendrive_bootable_using_cmd_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/77550482444.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/zinejitovanuta.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4637/files/balun_canan_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/xopijugelaw.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/direct_loan_master_promissory_note.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gerakofidasetivivirodipel.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/61578465446.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/14475386339.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/wirasolofenurafija.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/
    • https://cdn.shopify.com/s/files/1/0430/7949
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b4c.bin
0949a9fddd2d07f89b9d4feab537481def5b06954ed1a773c815643afe0c8c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4C 5028 bytes
font_01_sfnt_off00007c5c.bin
50d7ae34f1becccd33f73a9daa2687fdfca69ddec2405df3cee9eef5f6604eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5C 10420 bytes

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