Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9e92e072967c82…

MALICIOUS

PDF

75.7 KB Created: 2020-07-24 15:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96af5e23f892b6a31cac8f8e8c1fa5f SHA-1: 82b1a0dfc1ded640e66b96b14a6162c73a7dceb6 SHA-256: ea9e92e072967c825faf8365a9bd105e32a6bac3bd71b57e970ac655528cb8aa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Bollywood films 2018' and 'wkhtmltopdf', suggesting a lure to disguise the malicious redirector. The primary IOC is the malicious redirector URL, which is likely used to funnel victims to further malicious content.

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=bollywood+films++2018
    • http://files.jessicacarey.co/uploads/1/3/2/6/132682822/4228178.pdf
    • http://files.sekimitsuscholars.com/uploads/1/3/0/7/130775126/89875d4eecc16.pdf
    • http://files.jskarchitect.com/uploads/1/3/1/4/131437535/basoriputet-rejawevuxuxuved.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/tekosedulapuzoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/bevogixokakibebusute.pdf
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/jatusijasiliterugetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/xidimigibomapuradez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/vuwusegaluvozuwudumuligi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/pevowazizozasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/duwidumabuxanareb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1655/files/kitofisopotij.pdf
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/11670486862.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7038/files/xuwimexifaxadojumez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed3.bin
ca63e4391f3e8c473ea276b1caec886efdeb712a7172cb7918da028c9ee4a1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 4996 bytes
font_01_sfnt_off0000bfed.bin
d0206623a12099c74cb9ed683d749671a3a17524288a79fdb65677653d7292e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 15808 bytes
font_02_sfnt_off0000f14f.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16164 bytes
font_03_sfnt_off000106a0.bin
9920dfa01b5b97aae71562e255de66c4abfe03abeac46b77787d26e508e8b8cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 7664 bytes

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