Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2b39e13a370249…

MALICIOUS

PDF

92.4 KB Created: 2020-08-17 07:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ff64edf4b188eb7531411e6c6744d8 SHA-1: 67c0334151012a0b4c9b1c85ae5256b98358cd22 SHA-256: 5a2b39e13a37024921ca1aca26e19284fedfcfbbb521825e983b216a5e24be36
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 is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=metro+exodus+pc+guide', likely leads to a phishing or malware distribution site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting an attempt to manipulate search engine rankings or distribute content through a network of 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=metro+exodus+pc+guide
    • http://buxelat.mirjamaigner.com/uploads/1/3/2/8/132814930/bibimudapab.pdf
    • http://lavaf.knowledgeuponprecepts.net/uploads/1/3/0/7/130739560/29bb085996.pdf
    • http://dotozel.mcccil.org/uploads/1/3/2/6/132682646/2db1ec6.pdf
    • http://files.northernfitness.net/uploads/1/3/1/4/131437246/9588946.pdf
    • http://files.jasonhansoncounselling.com/uploads/1/3/1/0/131071137/17bf9f59490c96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/reduce_size_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/53232001341.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/19276905720.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/55274014599.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/fopodegabut.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/53338507253.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/recurrent_aphthous_stomatitis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/cancer_de_colon_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/5th_grade_math_fsa_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/96096731215.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/manideepa_varnana_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/mobirezupusonemalires.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/28265767501.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_off00012474.bin
e25d7d128358cb53e7f0d3bdb0dd0025981eb595dbb83155dc02f7ef5ec23739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 5072 bytes
font_01_sfnt_off000135d6.bin
feb4c3f3d29dfb0b06ee450c5d99f9b92d3daa24d1021f459908e0b05ecf7945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 14836 bytes

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