Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bd6900ebf3a1ae…

MALICIOUS

PDF

50.3 KB Created: 2020-08-28 15:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daace3b1526df87aedb4d73d060c9001 SHA-1: 488c696c5ce83f46b6b277b532ef663db4d0a67b SHA-256: f2bd6900ebf3a1ae29f131050aebc0a784415ad67a28946a0c21f8433e9403ad
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=justo+a+tiempo+libro', which is also flagged as malicious. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links within the PDF.

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.com/pify?keyword=justo+a+tiempo+libro
    • http://xapuru.mysuidora.com/uploads/1/3/1/4/131437626/nonumodawizerafos.pdf
    • http://wutal.larichardiere.net/uploads/1/3/1/4/131453574/1485918.pdf
    • http://files.magnoliatexasoutdoorliving.com/uploads/1/3/1/6/131637014/8693911.pdf
    • http://files.eloraroad.ca/uploads/1/3/0/8/130873846/4351281.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/oliver_twist_penguin_reader_level_6.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/45258898175.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/ruxafijotuteg.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/amleto_testo_integrale.pdf
    • https://cdn.shopify.com/s/files/1/0466/6959/4789/files/dolby_atmos_android_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4615/files/50872521824.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9101/files/xolukoger.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/29718682790.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/skryta_forma_celiakie.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0108/files/asfixia_mecanica_por_sofocacion.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/oxford_maths_key_book_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1335/files/unified_soil_classification_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/pavakagaterawepom.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_off000084d0.bin
87df8972607c960090ed2425acb3af5d12b55f5ac6c1de9673c3ec1d567ad1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D0 5092 bytes
font_01_sfnt_off000095ff.bin
b0523e57b5b206f024466f34f6e689ab34d641e168121ec6600a2b251e22cce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FF 11340 bytes

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