Malicious PDF — malware analysis report

Static analysis result for SHA-256 680f9dcce9d04127…

MALICIOUS

PDF

45.0 KB Created: 2020-07-23 08:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 564e8814f4618a8b9d2e8b96e73482b4 SHA-1: 9fd14cd758342aafdae365bea776cbbcaf43d20e SHA-256: 680f9dcce9d04127702acf027fa9d27ddb8bc919d7e4bf44a91780631307a352
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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=ayo+and+teo+songs++rolex
    • http://files.balperazim2.org/uploads/1/3/0/9/130969511/5234353.pdf
    • http://files.nexterawrestling.net/uploads/1/3/0/8/130813111/zejewajebolasi.pdf
    • http://files.myacexportfolio.com/uploads/1/3/1/6/131637306/5762611.pdf
    • http://files.meganalms.com/uploads/1/3/0/7/130739719/mawilewe-musegizororeli-xisedizifukob-jirusujilufuz.pdf
    • http://files.researchdesigndoctor.com/uploads/1/3/1/1/131164112/31287801494cdc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/63458291493.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/wubadugax.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/zazibedabimur.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/tivanisudabuviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0210/1923/files/45446236045.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/vofowemamuzodaxedeneboxag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/1924143173.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/risijugurosudituravol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/vifikozukibinateroro.pdf
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/gelogufegim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/belowariwalizazavi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/85580203273.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/8262132220.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_off000072b1.bin
af809cfe559b1fb597fe558ee0bcf74d9ee9e8a58aca6f54b753ed183415630b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B1 4892 bytes
font_01_sfnt_off00008363.bin
12fb493d3307fbd9187e05d4062188d640aad90261b910e86531b9e6404daa75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8363 10400 bytes

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