Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f0cd4e252389d…

MALICIOUS

PDF

38.1 KB Created: 2020-09-22 01:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a2684303be5f28a56f473783b98c1fc SHA-1: 4de8233af770ea997d46f4b7c7a53fba0b77fd5f SHA-256: 886f0cd4e252389d7debba2f3eab145ac8b07ea57cbd20a00be9e2138613d3a8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is likely intended to lead the user to a malicious download or phishing page. The document body and embedded URLs suggest a lure related to downloading software, specifically 'zpn connect apk uptodown'. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential SEO-based link farm strategy to distribute the 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.link/wix?keyword=zpn+connect+apk+uptodown
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/78486186785.pdf
    • https://cdn.shopify.com/s/files/1/0430/9290/2037/files/dosirotaduf.pdf
    • https://cdn.shopify.com/s/files/1/0465/2302/3518/files/84537070438.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/double_wall_glass_mug_bodum.pdf
    • https://cdn.shopify.com/s/files/1/0462/5042/6519/files/2nd_grade_reading_comprehension_work.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/funaguxegukotenopinixofus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3242/files/estrous_cycle_in_cattle.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/sikagivubotusudamitoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5044/2660/files/roc_royal_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/approximation_practice_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0933/4696/files/nikupogetogivuwipuvijet.pdf
    • https://cdn.shopify.com/s/files/1/0463/2710/3650/files/19243426914.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/72215530888.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/24147389657.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/dtv_channel_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/69188225348.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_off00005725.bin
4709d91f7f3ddef0b97808c0f85ad86795d6f7754cdd90e0c7e15b89571cd8e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5725 4876 bytes
font_01_sfnt_off000067e7.bin
24c6ff2d652f9fa2211f9f795833c606eb9b4a50f9b14f02f5aab1eaeb742653
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E7 10480 bytes