Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0e890ea6b3f1a9…

MALICIOUS

PDF

43.0 KB Created: 2020-08-11 07:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3e3d3d365088c40721283db172ec89 SHA-1: 26d8636074ae62ad774b5a35e30287e0630e699b SHA-256: fe0e890ea6b3f1a9e552e663bf45049da953328048cda67bbaa1cafcb7ae7e55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'carpentry training manual pdf' and the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=carpentry+training+manual+pdf
    • http://files.lakenormanyoungprofessionals.com/uploads/1/3/0/7/130775434/1338676.pdf
    • http://files.heritagekitchenfood.com/uploads/1/3/0/8/130813409/xobapajijoruxu.pdf
    • http://files.teamstringtheory.com/uploads/1/3/1/4/131405948/fc3b1cb4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/sezunewekoniwodizovusix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/89524996648.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/4725004747.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/muxekit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/amazing_grace_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/diweputofisabad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/online_converter_to_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/96111719161.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/chapter_zero_fundamental_notions_of_abstract_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/illinois_llc_annual_fees.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/47518704021.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/xaditapivepibonuj.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_off00006976.bin
fbcbd1b3c8664751eaa2a0e1413de16df6715d8664538e6c4f1fdb26c0f33866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6976 5192 bytes
font_01_sfnt_off00007b16.bin
0a84c5e4b118ca9d7a5b7fb55e68881af595815be6ec948da775b649aeb2dbda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B16 10484 bytes

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