Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87b3950f23dd234…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 10:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c635774a6a5c615c97eef2570cbdc3 SHA-1: e54ca68f67a7087bbae55f28eb11aae324f383eb SHA-256: b87b3950f23dd2342d69cb9aed1186ba11db76acc86b575d8c5aa1c44d885ba8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting PDF files, which is indicative of a link farm. One of the primary links, https://ttraff.ru/pify?keyword=beginning+intermediate+algebra+5th+edition+pdf, is flagged as a malicious redirector. This suggests the document's purpose is to lure users into clicking these links, potentially leading them to malicious sites or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=beginning+intermediate+algebra+5th+edition+pdf
    • http://xakumem.scalestuff.org/uploads/1/3/1/4/131438177/3d3b8a.pdf
    • http://files.liira.org/uploads/1/3/0/8/130813643/juvapibewaj_kedexifuzoguwiv_xikewigoxijeb_xideniwoxikok.pdf
    • http://files.turnerschoolofthrows.com/uploads/1/3/0/8/130814535/8098741.pdf
    • http://buxobadi.audiblethought.com/uploads/1/3/0/8/130814328/fefikavoruvi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/14449747245.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/2515482091.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/genunakov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/5261434708.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/mepoduvenufape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/sekajopopobidas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/54639423104.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/demotivation_poster_maker.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/70617416915.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/kaniletilajoki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056f7.bin
bec1a889bc1cb8b439f7f0792e94e0ddfe892cfad6f4b308120e16da514361c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F7 5376 bytes
font_01_sfnt_off0000690e.bin
75c246326db85af1537055e4be8bfc36b573df6521cc1c4f7aec1f473d0ad977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690E 10084 bytes
font_02_sfnt_off00008b57.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 4324 bytes

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