Malicious PDF — malware analysis report

Static analysis result for SHA-256 213bd15ba63d925b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-18 15:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcba654f0abab62e3c58e14bd80883c7 SHA-1: ea17febdc0127af6945b024f46ac3b472cbb9edb SHA-256: 213bd15ba63d925bb43755a0267b0015023c98979b11c36a41a1499a20edfdb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a direct link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the string 'transition words worksheet middle school' and the malicious URL, indicating a lure to entice users to click the malicious link. No scripts were extracted from this sample.

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=transition+words+worksheet+middle+school
    • http://tokudafat.chrishendersoncoaching.com/uploads/1/3/1/4/131407836/purovuwitadanewew.pdf
    • http://files.mrheadspe.com/uploads/1/3/0/9/130969656/5912769.pdf
    • http://gixojiw.durantroadpetresort.com/uploads/1/3/1/4/131453574/8398135.pdf
    • http://files.arizonamobiledetail.com/uploads/1/3/1/6/131637853/kekagirifejepaz-bixalegutek-lupedur.pdf
    • http://files.tacklingsuccess.org/uploads/1/3/0/7/130775518/998f016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6822/7737/files/dasuruxilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/fejugewebaxagenosukawaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/32685662645.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/45093985494.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/99853754145.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/femizurugudud.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/how_to_download_flickr_photos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/28847655661.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/78970595214.pdf
    • https://cdn.shopify.com/s/files/1/0433/4092/3048/files/programmatically_annotate.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/79631334476.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9942/files/zuxefapij.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_off0000520b.bin
d6b6cf0084959f183be88c9b73da8b4502b3d6e26995304e16b7a4013d44be69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520B 5284 bytes
font_01_sfnt_off000063e1.bin
0f5087f87876960e7e117b2d6a59b7ce04be0eb20979ee7725585c7b605a0d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 9616 bytes

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