Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a67e99b8fee4a6…

MALICIOUS

PDF

50.3 KB Created: 2020-08-06 04:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b97cbbeb43ff78f5c0db8b50342d1987 SHA-1: 583742fd2dc3958ec1e32310dfe9976e26563f69 SHA-256: 40a67e99b8fee4a651d59db94e723d56c7691baabad63c439c59d13162ecbbb2
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including Shopify. One critical heuristic identified a link to a known malicious redirector, traff.cc, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body itself contains the text 'Rudram mahanyasam sanskrit pdf' and the URL that triggered the malicious redirector heuristic, suggesting a lure to download or view a PDF.

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.cc/pify?keyword=rudram+mahanyasam+sanskrit+pdf
    • http://files.taryndryfhout.com/uploads/1/3/1/4/131453650/zajerox.pdf
    • http://files.cloud9creationsuk.co.uk/uploads/1/3/0/8/130814411/2491247.pdf
    • http://files.descholarshipfoundation.org/uploads/1/3/1/4/131437977/gokuf.pdf
    • http://kusisuf.febr-fdi.com/uploads/1/3/1/3/131384401/lufedibitezed.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/fateteranuvinolevaxaturef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudusojixidotivage.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/fesogaxedeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6330/files/51349325747.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/ghp_file_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2213/files/tukotipamemaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/xodevirudorexononosewob.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/61132984591.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/fox_minecraft_skin.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/govusixenejiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/jesanetinesewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/80127554189.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_off00006399.bin
60f9fc7f07a3fd17bd04f0f97799ec5aef4260b3ff3dea064d9a63fb7391c0b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6399 5424 bytes
font_01_sfnt_off000075ee.bin
9f566753b6fedec5354f0170727e6d603784401abd39bf577477211560e74489
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 14688 bytes
font_02_sfnt_off0000a2c4.bin
3f206162d4cd7b3b4dbebdec1baf71401106571ee1dcd82b1556eabb5c65b5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C4 7384 bytes