Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbfe965c811192f…

MALICIOUS

PDF

52.1 KB Created: 2020-08-05 23:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95a2deb22e442cab6501779c97d510d SHA-1: d9a34b33f22cb35cf5a8f5a4ad00957e902e1e99 SHA-256: 6cbfe965c811192fcb464f7f84c50544beec41b715f294baedffa2068fac4312
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.ru/pify?keyword=arduino+uno+basics+pdf
    • http://files.mrandon.com/uploads/1/3/0/7/130776254/ribagijejebakufetafi.pdf
    • http://files.brycecon.com/uploads/1/3/0/7/130776646/kebivagukomeku.pdf
    • http://files.renewstarserpentine.com/uploads/1/3/2/3/132303286/7387633.pdf
    • http://files.bizsign.shop/uploads/1/3/1/4/131438190/fuxijulo-zezewuwa.pdf
    • http://files.rachelloganillustration.com/uploads/1/3/1/0/131070894/vipipularepomow-loretivaviri-roxoluvavasig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/51584560463.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/gapalafagoferewixigeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/sokeremiwifiwafukikaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/xawanewakilapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/coleman_mach_rv_air_conditioner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/allen_bradley_powerflex_40_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/48008833787.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/wugabovubafesapuse.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/13575233120.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/niweduwedejovepelosof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/lodiwok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/public_administration_management.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_off00008186.bin
2251e5471ab7a92ca324431b7fc2f92dc3b33c79a9108f00d45ffa2570451149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8186 4928 bytes
font_01_sfnt_off00009237.bin
97eb1166876dfd7a26460ec30ed04b11dbdedb333535942c5b90e9bbba3efab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9237 10192 bytes
font_02_sfnt_off0000b519.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 4324 bytes

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