Malicious PDF — malware analysis report

Static analysis result for SHA-256 761fc669184adada…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 13:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 173bdd5945bd71b0280dcd3a782b4d26 SHA-1: 39bf56d628f3c5c8c8c707012963f97cd5f3ef70 SHA-256: 761fc669184adada3383addcfac19c609ba2965c9a0764bf87f95405f8e66164
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=arboles+bonsai+cuidados+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links.

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=arboles+bonsai+cuidados+pdf
    • http://nokov.hillarykursh.com/uploads/1/3/0/8/130814328/2284862.pdf
    • http://files.virgilmathes.com/uploads/1/3/0/7/130775940/kasavolitedisapinu.pdf
    • http://nitid.caneriverchildren.org/uploads/1/3/0/7/130740522/d22aaaf24e186.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/zalibidugiritabevodesasiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/zolanenasemabibok.pdf
    • https://cdn.shopify.com/s/files/1/0436/8665/8213/files/kitefinojenonoxizuwemim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/gumudejuxokoxor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/12703697782.pdf
    • https://cdn.shopify.com/s/files/1/0430/0547/7023/files/what_is_cognitive_behaviour_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/28890330212.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/69394062053.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/11767492111.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/gejavefusobonevajuvobumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/65724696763.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/bebitogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/92674661261.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a3.bin
fd593a432c4cea6a8386a4efeddee08750ee60ed3d6a306d192db42fa45a22a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 5276 bytes
font_01_sfnt_off0000739e.bin
b458ec120c929f2e6642a67e97fc79646ae220608345fb9078c37370a9e90d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 11336 bytes

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