Malicious PDF — malware analysis report

Static analysis result for SHA-256 02eb0271faafd4e8…

MALICIOUS

PDF

39.8 KB Created: 2020-08-26 08:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161a14aa5f690ac2eaf97b5e6f67836b SHA-1: 907a7a859a564d1c4794d3411a1ec0447c420f28 SHA-256: 02eb0271faafd4e8493003c21112e86698eec0e9e1cc529011acdcd431be1568
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one key link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. 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.com/pify?keyword=atomic+structure+worksheet+answers+complete+the+chart
    • http://midebumo.riverlandsredbarn.com/uploads/1/3/0/7/130776659/fe11546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3791/6312/files/34940392960.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/kamen_rider_climax_scramble.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0111/files/adjectives_year_1_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/22258869806.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/after_effects_video_editing_templates.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/nukoxodomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/zufumamaxodezisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.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_off00005cd8.bin
04e2192b38bd05cac05f83fa9547cf239743e39019d15dc115714860c1a6c859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD8 5320 bytes
font_01_sfnt_off00006ed6.bin
60fb72523aed96fbb77e5545511eb054bf7caabe885dd4f5f920ca1b19dabbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 10548 bytes

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