Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c3579b72e5a11…

MALICIOUS

PDF

53.4 KB Created: 2020-08-16 21:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33b5dc717a11aa3f01b90684c775a1e SHA-1: 4571d84deedf091d3145ebe66f2d151ca1a812d7 SHA-256: 2c8c3579b72e5a11bd228806bc7cf00a71599ee2c72e42c5880207d44a19edfa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a mass external link farm, with a critical heuristic identifying links to known malicious redirector infrastructure. The embedded URL 'https://ttraff.ru/pify?keyword=news+magazine+wordpress+theme+free' is a primary indicator of malicious intent, likely serving as a gateway to further malicious content. The ML classifier also strongly indicated 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.ru/pify?keyword=news+magazine+wordpress+theme+free
    • http://files.ukwctt.com/uploads/1/3/1/4/131407901/4717732.pdf
    • http://files.americanhomesteader.net/uploads/1/3/2/7/132710743/4282333.pdf
    • http://vemapux.rakshitbuildtech.com/uploads/1/3/0/8/130814161/rarozodos_pikexotifiga_zetonaxukowaxe.pdf
    • http://files.queenieproductions.com/uploads/1/3/2/7/132740288/893039.pdf
    • http://files.lighthouse100ultra.com/uploads/1/3/1/4/131452836/fekesaxotivelixeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/kilogudek.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8830/files/58937472291.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/probability_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/mamiladux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3410/6277/files/pdf_to_word_converter_nitro_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mowajuvide.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/dsm_personality_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0434/3054/3512/files/audi_a4_2004_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/grammar_test_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/62922082999.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/xezidawuvimasovin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8434/0630/files/68437280604.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092ca.bin
4cdb92c108dd6ad0d98577b0aa194b1b67b15da9b2074a1b0a9da4c1cd07c682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 5532 bytes
font_01_sfnt_off0000a58f.bin
62d0a90d9a2349e3be12b705f8aabdd15eb02a940b7f1204bd8825bb6c16e7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA58F 10172 bytes

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