Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18011b686cc5800…

MALICIOUS

PDF

35.6 KB Created: 2020-08-01 23:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37ca0d99356cb153dad55ee12d2c320 SHA-1: 0b73b705bdc533349fabbfd45b2258f2b3c3ffbf SHA-256: b18011b686cc580050f150aa01677522ec14d53fd10890cde56d2737c0cedfac
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=troy+bilt+parts+manual'. This URL is presented within the document body, disguised as a 'Troy bilt parts manual'. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt to distribute the malicious content. The ML classifier strongly flagged this PDF as malicious.

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=troy+bilt+parts+manual
    • http://files.farmtoschoolstarkcounty.com/uploads/1/3/2/6/132681647/mitifamiwux.pdf
    • http://files.khoueiryrealestate.com/uploads/1/3/2/6/132681757/lomizorelapubaf.pdf
    • http://files.mentalhealthandwellnessllc.com/uploads/1/3/1/3/131383651/8996236.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/dajelagexawaweri.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/lovijizetolixonijawakazok.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/14192851558.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/mofixexudevexuwub.pdf
    • https://cdn.shopify.com/s/files/1/0431/2426/1018/files/varuposelugaxibirutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/sozixefigutugewejerowabeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/nalef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/rutivosufekifataliva.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/50653727758.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/dometic_air_conditioners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/jetexorigumol.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/lelivowesalejuzi.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_off000047b3.bin
52bd327fc9267fce9c2d85b462010f57d71db3209d30cd8e659d57d972f806d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x47B3 5156 bytes
font_01_sfnt_off0000592b.bin
332fcdaecbf1c91d7e475e00413457163dab48bf9c5b9220bacb7b9711020f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x592B 12900 bytes