Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d67db300e46f2e6…

MALICIOUS

PDF

38.8 KB Created: 2020-08-24 17:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c4069b0bc617fc0f491a64b433e4ef SHA-1: e6c3e656b574aec74f6463ccdfcf49e686cf4a19 SHA-256: 9d67db300e46f2e6b8c001ce3c19bc34615091b3b457d3168b943e5466935e48
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=adjectival+phrases+worksheet+ks2, which is likely used to redirect users to further malicious content. The document body contains numerous embedded URLs, many pointing to shopify.com, but also several other unknown domains that are part of the link farm. 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.ru/pify?keyword=adjectival+phrases+worksheet+ks2
    • http://natepalaj.mvsterminerals.com/uploads/1/3/1/4/131437116/mumenozojabenoj.pdf
    • http://bemavu.stmartinspre.co.uk/uploads/1/3/2/6/132681670/7230741.pdf
    • http://files.nepalisydneychurch.com/uploads/1/3/2/8/132815054/6801665.pdf
    • http://files.caringhomehealth.net/uploads/1/3/0/7/130740465/a5148a794c1b17d.pdf
    • http://fawajigov.rrdiamondsdanceteam.com/uploads/1/3/0/7/130739625/lanoxofimalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43181801848.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/14380648435.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/sample_student_autobiography.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/algebra_1_problems.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/26205273491.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/il_bovarismo_jules_de_gaultier.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/xideperaligimujowuridafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6890/6906/files/corbettmaths_completing_the_square_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/fixelirizodamuwezafixutad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/labels_for_jars_free_template.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_off00005a30.bin
60b2a1fa0da8965d76e727885b20afcd91cf412bd9038ff50cf4a0323a0f04c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A30 5572 bytes
font_01_sfnt_off00006d33.bin
b2975eb7d6b68c260969d1fe497848b1879aacfcef31a6d2aa3bfbc2ffd36213
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D33 9756 bytes