Malicious PDF — malware analysis report

Static analysis result for SHA-256 183cb539f8bdc771…

MALICIOUS

PDF

70.4 KB Created: 2020-08-05 08:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a38e152adc3a266c120c0ad78b156787 SHA-1: 5c8e7f87f020cc8a6b1d6844063e732403aecfb4 SHA-256: 183cb539f8bdc77167ca9fa97e9bc76cec113d2ecefcf7858a7b404af9d44ece
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=production+of+red+blood+cells+pdf', suggesting a lure related to the topic of red blood cell production. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure, likely for SEO spam or phishing purposes.

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.com/pify?keyword=production+of+red+blood+cells+pdf
    • http://files.montaukbeachbungalow.com/uploads/1/3/1/4/131438557/delekoti.pdf
    • http://files.usagaslogs.com/uploads/1/3/1/4/131408581/b19098.pdf
    • http://files.northriversideng.ca/uploads/1/3/0/7/130775084/minuzetosu.pdf
    • http://files.hatwan.org/uploads/1/3/1/6/131637553/7149993.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/60023408497.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/pudigekavasuwegun.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/zilodosokexaf.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/64179598935.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/76548541004.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/45273287501.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/pagiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/autocad_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/86578295223.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/farumobipiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7605/files/nami_build_lol.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3843/files/29529575765.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/zejeramu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/78092405938.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_off0000d6c2.bin
465e4855c73b3f341946d878f7a505da6375a3083f61dce69e7fa296b3af0168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 5080 bytes
font_01_sfnt_off0000e81a.bin
decc68a56426c68f08a8dc7932a40ea61aa1571583c03c8f7f5e0eddbaba0bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10504 bytes

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