Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c646581e49c7f4…

MALICIOUS

PDF

40.8 KB Created: 2020-08-09 20:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af1b1c6833f17f4341164624fab5eef SHA-1: 5c95dfdca40e290c9397e6466341c9832bf3d0ee SHA-256: f0c646581e49c7f497d24a7696f6d8c8998dc9c46fa74da137762c3fa0b46d6e
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with the primary malicious redirector being 'https://ttraff.cc/pify?keyword=anemia+pdf+usp'. This suggests the document's purpose is to lure users into clicking these links, likely leading to phishing or malware downloads.

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=anemia+pdf+usp
    • http://files.irishwindenglishshepherds.com/uploads/1/3/1/6/131637656/mizapomazufe-daralijip-pakomugelef-niritif.pdf
    • http://files.sbt-oman.com/uploads/1/3/0/8/130813834/4470c699.pdf
    • http://vebid.internationalunicornassociation.com/uploads/1/3/0/9/130969742/463629f88e.pdf
    • http://vanofa.sharmalabuw.org/uploads/1/3/0/7/130775219/tidasozedesetagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/navy_seal_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/wupigeganimazuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/sociology_igcse_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/folufexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/katuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/basic_english_vocabulary_builder_activity_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/gepobejidezof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/your_file_host.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/karyotype_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/koxuwenijovimuzadoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/35274741425.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e3.bin
aa2f9f61269d0b9b8163b7828a2df2156d798efdcf58b4dc431baf47f736ee33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 5048 bytes
font_01_sfnt_off00007405.bin
2cb4702b767c801a7070f05ae770761cfc06c43581f8e501ddc03218f3ff4311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 10020 bytes

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