Malicious PDF — malware analysis report

Static analysis result for SHA-256 803f948152e270bf…

MALICIOUS

PDF

46.6 KB Created: 2020-08-21 14:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b1e29339b93824cc4ca8aa82ece9e6 SHA-1: 285294859cc79e9e7b2a4465b6a660adef886a7b SHA-256: 803f948152e270bfe91231ac2d58f71a6b6edc6904efa4771f0d7e562d9acfb3
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the primary malicious URL and references to '3d racing games free for android', suggesting a lure. The presence of numerous external links, many pointing to Shopify domains but also including unknown domains, indicates a strategy to distribute or mask malicious content.

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=3d+racing+games+free++for+android
    • http://files.infieldconservation.com/uploads/1/3/2/8/132814050/83a992f01f.pdf
    • http://reken.kadhampa.net/uploads/1/3/2/6/132681218/2556318ce63.pdf
    • http://files.russelsher.com/uploads/1/3/0/7/130739542/xipusag.pdf
    • http://files.christianoutreachtools.com/uploads/1/3/2/6/132683000/000c335f5d3.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/free_birthday_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4344/files/theory_of_c_language.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/33253524133.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/briscola_regole.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/death_penalty_argumentative_essay_against.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/nubidorirena.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/70196056895.pdf
    • https://cdn.shopify.com/s/files/1/0437/2378/4360/files/21478946202.pdf
    • https://cdn.shopify.com/s/files/1/0448/4956/1757/files/moscow_metro_map_in_russian.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/bugizujetifetida.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/nikibufuz.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_off0000782f.bin
6d68db37e35a6a08e5102ff112b1038a67ba965a272ec99059d26b8ef7f64190
pdf-font-stream PDF embedded font (sfnt) at offset 0x782F 5380 bytes
font_01_sfnt_off00008a57.bin
7b735fc6be735f16464c9b76366dc8ceb747834d674c344959aad19bc1ad09c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A57 10284 bytes