Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8fdfe7a4128cf…

MALICIOUS

PDF

41.4 KB Created: 2020-07-30 14:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51a552e538f552096981584d1ad273be SHA-1: 35cdd1ffed88593b55bf54b90e47416228a5f052 SHA-256: 08a8fdfe7a4128cf7bce0fcf9be7d13c2a72d9dc2aa712f20c86f2449ab4d8fe
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF is identified as a malicious redirector link, likely intended as a phishing lure. It contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs points towards a redirection to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.com/wb?keyword=intermediate%20accounting%20robles%20pdf
    • http://files.littlestarsfamilychildcare.com/uploads/1/3/1/4/131409017/daxaku.pdf
    • http://files.gatheringstitches.com/uploads/1/3/0/7/130776206/9361166.pdf
    • http://files.freedomfireministry09.com/uploads/1/3/0/8/130813461/4e3ff397ee5ef6.pdf
    • http://files.livewellcrawfordcounty.org/uploads/1/3/1/4/131438692/48552f.pdf
    • http://files.rayzimmermanauthor.com/uploads/1/3/1/3/131382673/1303474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/rotigajekolemagenipaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/risabakifosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/58198477167.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/16927515826.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/12617141181.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/94185344536.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/77755894673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/govemojivudefugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/vuvonukitokotaxewimom.pdf
    • https://cdn.shopify.com/s/files/1/0434/3945/6423/files/78891854736.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005449.bin
09f92ef2dee7202d8a9a4e1b1301e3a964fd36b08e5b6a6bb60c5da556f482b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5449 5436 bytes
font_01_sfnt_off00006692.bin
1144ef1fc6eaa00014c0a7bda3f1d77067fd910b32d5ddd24c025af0e37df20e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 8064 bytes
font_02_sfnt_off0000823e.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823E 16344 bytes

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