Malicious PDF — malware analysis report

Static analysis result for SHA-256 089661bc9e821c88…

MALICIOUS

PDF

34.2 KB Created: 2020-08-12 04:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0d5f91fcc7bbd0eb34e4d598dfc1e0a SHA-1: 3282321f496fc5a7adf8447bdfa6c6ff3aa21e1c SHA-256: 089661bc9e821c88572a5eba4397c84fef0bfe95aa03ad00c477b7670f325b1a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'ttraff.ru' as malicious. The PDF_SEO_LINK_FARM heuristic indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to lure users to harmful sites.

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=citrus+college+campus+map+pdf
    • http://jiwokeb.tanyachesnell.com/uploads/1/3/0/7/130738799/9167872.pdf
    • http://bazetig.hanaadlicsd.com/uploads/1/3/0/7/130740490/molazamunasad_zugipixaveji_wetumerinuxi_ripapapakava.pdf
    • http://files.berwicksewerdistrictme.org/uploads/1/3/1/4/131453598/9080531.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/bozil.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/82508632740.pdf
    • https://cdn.shopify.com/s/files/1/0446/3912/5667/files/artificial_intelligence_in_mining.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/jibudonumumu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/nimes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8266/files/breeds_of_cattle_and_their_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/44990725575.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/4006/files/it_is_well_with_my_soul_audrey_assad.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/mijepifulepemokekateweno.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/mercado_livre_de_energia_eltrica.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/23561536576.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/roman_catholic_encyclopedia_1940_volume_8.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_off000046bb.bin
d54aa3630bcdfba4356708089b6860d23b23ab346367ec611f79a840373861c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46BB 5380 bytes
font_01_sfnt_off000058ed.bin
03b321849bf32241ce0f37f0467645a84c8d55c16bed539f7bd802a0569df4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 10268 bytes

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