Malicious PDF — malware analysis report

Static analysis result for SHA-256 0525356b4e5a6169…

MALICIOUS

PDF

41.2 KB Created: 2020-07-30 13:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99bdbf2d4d857b53085d7b04ae582588 SHA-1: 10dbe5f631eb53e70e100c72b52c82cf7ab80ae1 SHA-256: 0525356b4e5a61695909e45fd3d0e7fdeb5e615d756ee8a11a7aecd735f128cb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, appears to be a lure related to academic content, suggesting a phishing or scam attempt. The presence of numerous external links, including a link farm, indicates an effort to drive traffic to potentially harmful sites.

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=kamus+kontemporer+arab+indonesia+pdf
    • http://files.annettebarkerministries.com/uploads/1/3/0/9/130969639/6319214.pdf
    • http://files.joannaberesford.com/uploads/1/3/1/3/131398475/9500554.pdf
    • http://files.sos-socialmedia.com/uploads/1/3/2/6/132681307/xetazelevepufewofata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3567/0166/files/71668306702.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/bijirezufared.pdf
    • https://cdn.shopify.com/s/files/1/0430/1452/0995/files/punosedukazenapezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/kifazarubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/dedibaken.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/75636537749.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/pijukosukifobuvebovolaxok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/46481984154.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/gepulebofurunuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/medim.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_off000062f8.bin
a151fc30bb085b4b1e0616d1704c462b3670bf43d80cf38839a1ffbe2bc6e9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F8 5212 bytes
font_01_sfnt_off0000748d.bin
3126017c866882e887a2f28775ee610c151fdea77a9a85c4d2255b6bf883cf11
pdf-font-stream PDF embedded font (sfnt) at offset 0x748D 10492 bytes