Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9239f0340a8c3f7…

MALICIOUS

PDF

45.3 KB Created: 2020-08-19 04:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d75478aba40d113f1076844753c037 SHA-1: 9402edc27c9a34d34ab055e9363f69a5536da7fc SHA-256: d9239f0340a8c3f79d19ee958b0e2218259b9830d20ae68f0f002a255972c092
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as "knowledge base article template examples". This link leads to a link farm of numerous PDF files hosted on Shopify, indicating a potential SEO poisoning or phishing campaign. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and the PDF structure itself are indicative of a redirection-based attack.

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=knowledge+base+article+template+examples
    • http://files.middleclassempowermentzone.org/uploads/1/3/1/1/131164260/4652949.pdf
    • http://sejejeni.seagrasspottery.com/uploads/1/3/1/8/131872225/856360.pdf
    • http://files.sterlingreputationspr.com/uploads/1/3/1/3/131382595/fofosurufunakomexut.pdf
    • http://files.kinder-equipt.com/uploads/1/3/1/4/131483281/5464694.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/vifotutugigepakubuzej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97503793953.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/sedurinewevup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/administrao_pblica_patrimonialista_burocrtica_e_gerencial.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/ginidulaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0294/3909/files/vifovarabar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/kovokaxinejug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/95171244582.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/7529716418.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/jefalataxudalexosawig.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/7150027429.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bf.bin
28db679db15ed7f912cf5d38168babba3b166c9bdf9cbcfd4faa8963404bec6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 5664 bytes
font_01_sfnt_off00008505.bin
aec0449aac239ccde84001e28cbe3dbba55f0e932c3e441ae4383af352c06099
pdf-font-stream PDF embedded font (sfnt) at offset 0x8505 10244 bytes