Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7f1743e6762bed…

MALICIOUS

PDF

51.3 KB Created: 2020-08-04 18:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29539179702bc691e4a726cebb111e47 SHA-1: ba7c003ebe49d29e8a05b5b9c58a3b94c8a18463 SHA-256: fa7f1743e6762bedd959ad5af3eb87db26c9376f96a00980974c70f7435bda00
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=maths+questions+for+class+6+pdf'. This indicates the document is designed to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering through a deceptive document.

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=maths+questions+for+class+6+pdf
    • http://files.kpquiltingstudio.com/uploads/1/3/0/7/130775867/8e50e.pdf
    • http://files.peaksandpaddles.org/uploads/1/3/1/4/131452735/29203.pdf
    • http://files.southernappalachianworkcenter.org/uploads/1/3/1/3/131384145/893774e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/41712212800.pdf
    • https://cdn.shopify.com/s/files/1/0429/9027/2675/files/2016072351.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/lixijoxesawot.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/89733439935.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/list_of_bsc_agriculture_colleges_in_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/gewalurorobinomupa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/xivuvefolobupafegevamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/cookie_clicker_one_mind.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/92040576802.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/arduino_uno_r3_specs.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/woresuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/gimijapinatabetazonodex.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_off00008904.bin
67516b194c2f74c541e207c684f0d049a3b0e4fe335728a8e012ba20a984d701
pdf-font-stream PDF embedded font (sfnt) at offset 0x8904 5528 bytes
font_01_sfnt_off00009bd5.bin
dfaf31bf977f497be82bf7f70a3e8778f8e0a3bdc319895de5f0e2e98e5cf182
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD5 10668 bytes