Malicious PDF — malware analysis report

Static analysis result for SHA-256 b913357db72a019b…

MALICIOUS

PDF

37.1 KB Created: 2020-08-20 04:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea89b0b932963be1713b0e18a76d3518 SHA-1: e7ca13108d7c9e0ce3606119d7c8099374136577 SHA-256: b913357db72a019befeb0755e190515d751f70976b83e525efb2a229630ab8f6
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a label printing template. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=avery+label+printing+template+5160
    • http://maban.sarahtiltonart.com/uploads/1/3/1/4/131453133/gexewufitixosel.pdf
    • http://files.macptsa.com/uploads/1/3/2/8/132813998/femewev-refexenenenopa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/xikel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/11287821204.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/baby_development_during_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/49929479166.pdf
    • https://cdn.shopify.com/s/files/1/0429/7739/4847/files/3462777418.pdf
    • https://cdn.shopify.com/s/files/1/0429/7746/0383/files/2008_volkswagen_jetta_wolfsburg_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9018/9215/files/company_profile_structure.pdf
    • https://cdn.shopify.com/s/files/1/0433/3689/2584/files/rawoxijowukikaro.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/gitlab_custom_ci_templates.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_off00005260.bin
1d5450dd4f6d9a074f06b92c585aa0a830a29283e0b04edce287209f28bc1e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5260 5724 bytes
font_01_sfnt_off000065db.bin
a965adfd6b55e216a837860abd3899335bcd6e3d45b58e08e9a60a6ee990235f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DB 9904 bytes

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