Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f39996a6d608cab…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 14:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fee42920e2788baf9d26e78d0a2a0923 SHA-1: 8cc0d69583d5a8345a676ba766f8c38429a6b3fe SHA-256: 6f39996a6d608cabf71dc7f10406560c6d514712429f2884f856847ff54ee243
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to medical information, likely to manipulate search engine results or trick users into clicking the malicious link. The presence of numerous external PDF links further suggests an SEO manipulation or link farm tactic.

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=cerebral+angiography+pdf
    • http://nitaluba.scentualgoddessus.com/uploads/1/3/1/6/131606183/733691d01c6.pdf
    • http://webuvu.christianadam.org/uploads/1/3/1/3/131383483/cba5ccc18069ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/nibudodaziteruvelesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/84777206784.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/vakaraxijurabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/35055894232.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/38054563686.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/19456049885.pdf
    • https://cdn.shopify.com/s/files/1/0437/5078/5173/files/appium_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0433/9449/8709/files/magovijiberisisapuguso.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/jajusiximalipopelepirova.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/kigesedejovemowul.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_off00008fe3.bin
1064a9640529a76c5a515d642e0884660119e4c1cb8da1abdbbcb8a84c14dd25
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE3 5272 bytes
font_01_sfnt_off0000a1c0.bin
a186beeab6ad3a50237035b35b2bab43bd9f4e36e760227187d57806723a0e45
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C0 11884 bytes