Malicious PDF — malware analysis report

Static analysis result for SHA-256 884139b29e042cde…

MALICIOUS

PDF

76.3 KB Created: 2020-08-08 01:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56b2916d0aa539b3d194545d91c9e628 SHA-1: 387dd7583faa42d0515030705b660156caf2e0bd SHA-256: 884139b29e042cde095a9855a1b5e01570a01812bc4596a31d397d421138f205
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a search result for a PDF. This link is also present in the document body. The PDF also contains a large number of external links, indicating a link farm, and was flagged by an ML classifier as malicious. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest 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=astronomy+today+8th+edition+pdf+chapter+2
    • http://venaxiva.shannonkmccurdy.com/uploads/1/3/1/4/131409090/rugizapiben.pdf
    • http://files.irontownmfginc.com/uploads/1/3/1/6/131637108/dobosex.pdf
    • http://files.astanderartandscience.com/uploads/1/3/1/4/131453054/siguwevaxufom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/jowalugulalebawuwuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/zomigowisurimed.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/dosowamufubafojiribe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/python_read_csv_into_array.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/63146941740.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/pua_routines.pdf
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/50897350195.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0431/5198/2754/files/bubujikafuzazufufeduba.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/brisbane_suburbs_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/11304719745.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/viwelodabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8302/files/18272396376.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_off0000eb97.bin
961817b58a51c74ec02f44b13aaabfd25f75bb89e68ae866ec2550636111a2bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 5780 bytes
font_01_sfnt_off0000ff25.bin
0a3810bfe6e3b5d0d2c40d2f1454d2ae78d85a67ae31d590b05b23191e50aba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 10876 bytes

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