Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea85a6b67191b66c…

MALICIOUS

PDF

37.5 KB Created: 2020-08-02 18:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6b3c9c9777088ca56cd308de33b0b3 SHA-1: 4a736e5095e45519f9c7af4fd266c57d678beee9 SHA-256: ea85a6b67191b66cd9b748a1204639e4745bcdda1dfd3def5d80362f6e5a209a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to lure users with search-like terms. The ML classifier strongly supports the malicious verdict. The primary attack vector involves tricking the user into clicking a malicious link.

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=digital+design+morris+mano+4th+edition+pdf
    • http://files.bristolcardiotennis.com/uploads/1/3/0/7/130776561/4c67a9d9.pdf
    • http://files.walthamforestwomeninbusiness.com/uploads/1/3/2/6/132682124/vonolura-nugitux.pdf
    • http://files.pikespeakbybike.co/uploads/1/3/2/7/132740482/vemovolidefowu_mawidefob.pdf
    • http://files.eastbrooklynhousing.com/uploads/1/3/2/6/132681194/nusamek.pdf
    • http://files.eagleforumoc.com/uploads/1/3/1/6/131636825/punubapovekatezajono.pdf
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/juvof.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/busosaxosamakuzixenole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0912/files/13697861485.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/41459889445.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/28488966936.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/muzanitiwepasowam.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/dewex.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/58277356333.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0552/files/zotizimofibigofikimimeka.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/51251291699.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/lamozazizanovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/fopubizuvixezuwabutusewib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/tubezerawiri.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_off00005515.bin
0ce834dbc755a2ac8642523eea75b25bc42285c79369cf262b297f9e0e085a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5515 5540 bytes
font_01_sfnt_off000067ce.bin
3a02691c1d40747995984a33022c56b86395d1676e49d67bbd448d597e1939c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CE 9648 bytes

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