Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad065ed26eb5bd9…

MALICIOUS

PDF

43.0 KB Created: 2020-08-17 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24df44c4c2fa65c5a045d379081b5706 SHA-1: 0b707230105feff5556f3d0e4b58368993c85b10 SHA-256: 6ad065ed26eb5bd97a4fc0b07625d5962e294c88fe99c249fe6f6fe023eb6f19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=vsco+x+full+pack+2018+apk'. This URL is presented within the document body, suggesting an attempt to trick the user into clicking it. The presence of a large number of embedded links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious destination. The ML classifier also 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=vsco+x+full+pack+2018+apk
    • http://files.mercychurchkc.com/uploads/1/3/1/4/131438835/176029e.pdf
    • http://files.olof.waggamatters.com/uploads/1/3/2/6/132696263/fofopuzo_borap_bukidirotawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/bukimufizonolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/introduction_to_statistical_relational_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/zirisekiwixedajepekuwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/golikatito.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/35179358336.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/biomorphic_forms_and_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/41363437646.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/new_college_application_form_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/subiz.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bc.bin
f271e5680a7026a735e0eace41b6f4cf37011bd10e5194492f1970bce2328649
pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 5532 bytes
font_01_sfnt_off00007baf.bin
ad0ef4d80118c91926863d7a526966300170a863b12e3eba229f0f61f7f12663
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 10424 bytes