Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13200751d45162d…

MALICIOUS

PDF

46.2 KB Created: 2020-08-14 02:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad07a5f4379f9ce483150afd3d66a71 SHA-1: 4f2e86493f1d871c7a3c183bf562777663b05813 SHA-256: f13200751d45162d599a5267281ccb98063fcfb0a6c5c1f0d1823682be4ada46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, a common tactic for SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=anti+smoking+posters+free'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same lure text as the redirector URL, suggesting a social engineering attempt to trick users into clicking the malicious link.

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=anti+smoking+posters+free
    • http://ruxuxufim.wmdodgearchery.co.uk/uploads/1/3/1/8/131857419/7ae01.pdf
    • http://files.jaicenterforwellness.com/uploads/1/3/0/8/130813364/dulaje_nomuvafuta.pdf
    • http://files.cornerboutiqueinmilan.com/uploads/1/3/1/8/131871633/7171b20ec7.pdf
    • http://files.noellejolynn.com/uploads/1/3/1/0/131070230/tirem.pdf
    • http://files.homeopathy-cures-you.com/uploads/1/3/0/8/130813934/kujijalaxone-rivapudufoxazi-kimula-muderof.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/66996536260.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/49231430150.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/37985124375.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/92431122528.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/asperger_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/mevizabagewewobedakugexog.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/shell_script_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/zitedaxanoveda.pdf
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/juduxanavanijuvorugorer.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/real_estate_wholesale_purchase_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/scorpion_mortal_kombat_moves.pdf
    • https://cdn.shopify.com/s/files/1/0428/6054/4156/files/30599516548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b18.bin
4791d7d17af5e38d17925851cc1a0311de2d490f0a2fb427ae6e951628267833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 4820 bytes
font_01_sfnt_off00007b65.bin
02312079bb8f39a75039350cad7d09ebd9270d01861dd62596922e25f15c70aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B65 10092 bytes
font_02_sfnt_off00009dfa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFA 4324 bytes

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