Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a99c0347ba773b8…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 05:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7dbe2d9ac261dc23aca5b3c3a58cb8 SHA-1: a2c8503337e2b7f4a0119a87f10e4970077d2640 SHA-256: 1a99c0347ba773b8ef0985110af5d6f587e6825952721709350039ec2d768392
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which points to `https://ttraff.ru/pify?keyword=biology+book+pdf+ib`. This indicates a phishing or scam attempt, likely to lead the user to a malicious site. The PDF also contains a large number of external links, as flagged by PDF_SEO_LINK_FARM, suggesting a link farm or spamming technique. No scripts were extracted from this sample.

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=biology+book+pdf+ib
    • http://files.thetanneryofcoweta.com/uploads/1/3/1/4/131438313/vetixalodixedog.pdf
    • http://files.joshuablehman.com/uploads/1/3/0/7/130775249/gewupejametu-savimazebewuli-dupiwi-xaxavab.pdf
    • http://files.cloudninecuisine.com/uploads/1/3/0/9/130969744/457f0.pdf
    • http://files.shirful.com/uploads/1/3/1/3/131398489/muvigilug.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/64624328540.pdf
    • https://cdn.shopify.com/s/files/1/0443/1160/9500/files/marine_forecast_panama_city_fl.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/dizedigejewuwojeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/9324459625.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/88598653268.pdf
    • https://cdn.shopify.com/s/files/1/0437/3331/9831/files/dixegidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0269/files/rikesemifisusugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/86978966622.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/62080265209.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/wedemanubexevidikewiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/44870792438.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_off0000703b.bin
da6acdb50fba8826dfb5ef9567a9eeaaadc5c10d6076924b9aec529bba4e56cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703B 5080 bytes
font_01_sfnt_off000081ab.bin
82e8fab528a6e7390b87cd549714898968e3574ff0cb5449aee7c4e04d797e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 10320 bytes

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