Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e4e3526ffbc91a…

MALICIOUS

PDF

35.9 KB Created: 2020-08-21 03:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6922aecf2f3f65b1de5c1a51e94b03d7 SHA-1: 46706b3190154290eafafb96979ed4ac22861ef7 SHA-256: 62e4e3526ffbc91aa540b1c80feface78d6b7df8991ae3f2332cc57e8af72416
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL. The PDF also exhibits characteristics of a link farm, suggesting a broader SEO-based spam campaign. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=chrysler+town+and+country+2016+user+manual
    • http://xebebifag.hockeyaustralia.net/uploads/1/3/0/7/130775797/rivakipezatifesolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/valutigopeliwogaraw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/calculus_4_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/mixuduxude.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/22064433057.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/gaxinapemijovoxibamoliba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/bonus_amendment_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/xujirixoxofuzunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/badal_movie_song_bestwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/jezikanavodudeba.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/72727791582.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_off00004e9c.bin
9f9e7d07d831bf9610c414b54a8e578c391d2b30ca7de9f52aebe2ea3454fe58
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9C 5756 bytes
font_01_sfnt_off00006220.bin
74cd4c8675ba3374ac30b8b72795c4861396468e42c1e5901aeae5f09fcf1747
pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 9524 bytes