Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ed2d9d96b28405…

MALICIOUS

PDF

37.4 KB Created: 2020-07-31 19:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238abc15bc6651ab0a65675e39e98f99 SHA-1: 4e1d404109604de6fbd05682788a88893cf148bf SHA-256: a7ed2d9d96b284057837cebe357a2d606a0f6c8a661b79b0d0280355c0e63f5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains, which are part of a link farm. One of these links, https://ttraff.ru/pify?keyword=lor+stackks+you+knew, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking these links, leading them to potentially malicious websites for phishing or malware delivery. No scripts were extracted, and the document body content is largely unreadable, but the heuristic firings strongly indicate a malicious redirection scheme.

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=lor+stackks+you+knew
    • http://files.goodlyframe.org/uploads/1/3/1/4/131483336/15e16c.pdf
    • http://files.trinitybaptistglobeaz.org/uploads/1/3/1/8/131857364/8382267.pdf
    • http://files.greekelearning.com/uploads/1/3/1/3/131380627/lutazuzogewiles-vulumituxu.pdf
    • http://files.zeinabaltagi.com/uploads/1/3/1/3/131383228/dezobix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/rolawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/54230271688.pdf
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/69220046758.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/samolote.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/54885899107.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/pejibobozerovulesawawuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/sukikowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/19569713109.pdf
    • https://cdn.shopify.com/s/files/1/0436/9114/7417/files/jemameledaweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/52228985816.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/ketodewik.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_off00005387.bin
57b8d17d96f00ccf847564c1efa309b6e03fa45d6b1eefef31a5f57be279d3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5387 4960 bytes
font_01_sfnt_off00006493.bin
ce01a40ca0f3942c1248d5815ff81ee934c158927774fef81c68876bef37f456
pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 10576 bytes