Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9b44890cdcbd6…

MALICIOUS

PDF

45.5 KB Created: 2020-08-09 07:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 602b28eb196cad33baf1e2af609b9f7c SHA-1: 5cf6c4230332d3d1f25bfb8ebc70733d204b66f1 SHA-256: 77c9b44890cdcbd619260668814cb63ad36820d3e8da14e99e2ce373a6c016eb
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to manipulate search engine results. One prominent link redirects to 'ttraff.ru', identified as malicious infrastructure. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users into clicking it. The presence of multiple embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=cover+letter+sample+for+resume+pdf
    • http://besukera.stellaheducationcenter.org/uploads/1/3/2/3/132302872/jesosunemas.pdf
    • http://files.fcchoirs.org/uploads/1/3/1/4/131482968/4117951.pdf
    • http://wakekuj.oldlakewoodshop.com/uploads/1/3/2/8/132814930/5fb76.pdf
    • http://files.shizokukaratedo.com/uploads/1/3/1/4/131438234/lomif-joxaw-posegogekumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/dupuzakedezuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/sexuvafukufusirup.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/fakanevobo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/varuvomukex.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/card_player_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/download_adele_25_album.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/280680.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/kimokusazewewonasaluv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/zevedivamematexomipusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74195332560.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006695.bin
3a5ba82451ecb9a2bb33c8dd3c039b63dbea539cc0df55ea6f7dc9dbc9c83fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6695 5000 bytes
font_01_sfnt_off000077a8.bin
8e6552397b47588c8ff34d35d85713893c5fc128d3f5f02c64b14d8e79cb7e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A8 10232 bytes
font_02_sfnt_off00009aae.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAE 4324 bytes

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