Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa58bc975db6c1…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 19:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bde5d88aed81ae4e231504d03cc42ff9 SHA-1: a50887bef878bd9bb88f3397c136b1c2020ca997 SHA-256: 81aa58bc975db6c1e099482591ff57d0b558ba41cb01a40e1531e894c4213714
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, a technique often used to direct users to malicious sites. One of these links, 'https://ttraff.ru/pify?keyword=android+accelerometer+speed+example', is flagged as a known malicious redirector. The presence of a large number of external PDF links, including one hosted on a suspicious domain, suggests an attempt to manipulate search engine results or distribute further malicious content.

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.ru/pify?keyword=android+accelerometer+speed+example
    • http://mozasoju.natteyallockps.com/uploads/1/3/2/7/132740373/diwirozalik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3450/8455/files/grant_cardone_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/mebumegalurujogunedev.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/24973304058.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/goromenizatub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/81956381426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/40773208468.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/32515467789.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/76180246641.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/53244247917.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/66857220989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.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_off00005e65.bin
492c20241b39ff0113e80327495986929e58da9b62817659761cbde8a7817014
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E65 5276 bytes
font_01_sfnt_off00007038.bin
2dc5b3ed395ec025f72321cc6cbc38fbd3957bc9a40e8dbf0c040233db2f6660
pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 10068 bytes