Malicious PDF — malware analysis report

Static analysis result for SHA-256 887dadf843cf1a82…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 11:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3743fc6ac8f54ad36826adc5a914d51c SHA-1: 93da6207849a8765d14242c2def2a34f7adc5c54 SHA-256: 887dadf843cf1a820ef2df4418e5fd8dfb2100f89cdec61aa8e7f0678bd78323
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being ttraff.ru. While many embedded Shopify links are benign, the presence of the malicious redirector suggests a phishing or malware distribution attempt.

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/wix?keyword=the+iliad+lattimore
    • https://cdn.shopify.com/s/files/1/0440/4923/6118/files/why_you_crying_mama.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/caesarean_section.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/grade_9_ncert_science_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/basic_computer_course_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/school_management_website_templates_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/rarukegomutozinufaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/53746887005.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/zevavekajevokal.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/pleural_effusion_etiology.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/62329577475.pdf
    • https://cdn.shopify.com/s/files/1/0434/3798/1852/files/18593399563.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695f.bin
a99982b342d20c30fc7b4718806fcd4a0ea4ae9e21e5abd18c14d09334615d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 4516 bytes
font_01_sfnt_off000078ac.bin
4bcff905c35c7fb0512eee6f6c00573f35d280d6bcf97926768544db64e417d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x78AC 10420 bytes
font_02_sfnt_off00009c28.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C28 4324 bytes