Malicious PDF — malware analysis report

Static analysis result for SHA-256 1149e151b1b2fab5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 21:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 720c9d66f79545f9845b4ea504cdc25c SHA-1: 5141c316311cf3299a66b55ae245fe9e5860debe SHA-256: 1149e151b1b2fab5ab93c67931c85c2b3abc410545e391d849079259aae4de4c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to a menu or training guide, aiming to trick users into clicking the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to lead the user to external, potentially harmful 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.cc/pify?keyword=ocean+basket+menu+2020+pdf
    • http://files.buildteacherhub.org/uploads/1/3/1/3/131397971/duziwasab-sasamasedixipef-ruluxerix.pdf
    • http://files.sakinaliterarysociety.com/uploads/1/3/1/4/131452904/nowiraba.pdf
    • http://nubuti.vaughantractor.com/uploads/1/3/1/4/131453284/kitubapomiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/training_guide_maplestory.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/nowixemelutewepakegitat.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/sojazasan.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/55094289515.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/jitawedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/43762337802.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/fefikugapiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/anne_carson_poems.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/43092512139.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/benjamin_franklin_biografia.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_off000061cf.bin
f2396aea1697acf393e1c96ecd3377eabeeb666ca0079dcb63d4280604bfe847
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 5676 bytes
font_01_sfnt_off0000750e.bin
5f29395072e55cc4c6ff5eb099b465c31264677fc049560842f42ec0bebc1be5
pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 15132 bytes