Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa7a7e5cd324ff5…

MALICIOUS

PDF

42.5 KB Created: 2020-08-03 10:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40126a9d0e13aaa8c4114fc60126ecf SHA-1: d88496cffb2d22b7a4e3bd9ed4e0612498756389 SHA-256: bfa7a7e5cd324ff5bff34338b69995c80c3ff6cd93ac1bb94bc029028973e3cb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Cub scout wolf handbook". The PDF also hosts a large number of external links, many pointing to Shopify domains, which is characteristic of a link farm used to distribute malicious content or improve SEO for malicious sites. No scripts were extracted from this sample.

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=cub+scout+wolf+handbook
    • http://files.verytraumatic.com/uploads/1/3/1/4/131453397/limitu.pdf
    • http://files.cicenvironment.ca/uploads/1/3/2/7/132740270/reliku.pdf
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8799/3763/files/cerner_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8218/files/29689001627.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/gegekavukudos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/1932908998.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/coherence_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/he_s_going_the_distance_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/kizusadadunejuvamav.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0067/files/66153220716.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/hbr_guide_to_office_politics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/51146664547.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3523/files/62623283764.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/58393847959.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/28746727670.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/lake_monroe_fishing_report_2015.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_off000067cd.bin
a651edd79b9e3698a52b65b12e6087fee5bc77e831d84a1210c10cc331c7849c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CD 5212 bytes
font_01_sfnt_off00007999.bin
59277d49279b7e59ce1ddafe8a8efad37c05f8a2291eee2ba25ca2ff20eb4c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7999 10420 bytes

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