Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e748d8619220ed9…

MALICIOUS

PDF

39.3 KB Created: 2020-08-02 05:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21da084234a238908e9a07715e6ccf1c SHA-1: 82ab20e485ed6293e2dba2fcce0fc619bf93ef30 SHA-256: 5e748d8619220ed9343a488919ea36fc7f75c5fd40115be095c0fcaa16636998
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its inclusion of a link to a known malicious redirector, ttraff.ru, disguised as a "Briggs and Stratton owners manual". The document also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attempt.

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=briggs+and+stratton+owners+manual
    • http://files.huntsvillemilitaryband.com/uploads/1/3/0/7/130776225/7aa31dab.pdf
    • http://files.kimberlycommunityband.org/uploads/1/3/0/7/130739004/6555479.pdf
    • http://files.jenkeyte.com/uploads/1/3/1/4/131438692/4254917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/pisamufote.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/laruw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6417/2445/files/74811109960.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/77266634888.pdf
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/41131946098.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/kubakufupagakexabuzeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/fixurinunumevamuwifuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0395/files/95791137824.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/20113743088.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/my_teacher_ate_my_homework.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/wuwosutokirevumakak.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6565/files/14980729414.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/vejemapudutazofesonojowu.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_off00005cf7.bin
1d38ea45267b696b972cccd5673db8ffa0dde47615c191725be5eaa2c2089f70
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF7 5288 bytes
font_01_sfnt_off00006eed.bin
eb87940f4f560030468b72fa35e6d9ad7855198df269abcf9a9013cf98babe7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EED 9796 bytes