Malicious PDF — malware analysis report

Static analysis result for SHA-256 60085aa7ac67e10a…

MALICIOUS

PDF

40.3 KB Created: 2020-08-03 03:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2a0040c91c02fcbb524160632c61f5 SHA-1: a1d1b3cdb2da23c6a9203abda44f46530d61daa9 SHA-256: 60085aa7ac67e10a3f006f94b17902fc9c4c3f4e7e634663db02d6f47e47e521
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and contains numerous links to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.ru/pify?keyword=kohler+engine+manual+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating a likely attempt to drive traffic to malicious sites under the guise of providing a manual.

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=kohler+engine+manual+pdf
    • http://files.dalessandroscouting.com/uploads/1/3/1/4/131408581/3537013.pdf
    • http://files.mosaicsbyvictoria.com/uploads/1/3/1/4/131482975/ddfc831080.pdf
    • http://files.bereanbaptistboone.com/uploads/1/3/1/6/131606155/wetexidumi_torexujakifiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/78136556357.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/dd_form_1380_field_medical_card.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/41968364741.pdf
    • https://cdn.shopify.com/s/files/1/0429/2624/3996/files/54548202511.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/41932237228.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/wofolajowogar.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/faserovubofifusujowejimir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/99666592961.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/7384712126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/72039934221.pdf
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/bosch_fuel_injection_pump.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/fosizolazulefobunamux.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_off00005cd3.bin
a57fca390a81820eefca7d40ad029f2be0cac71d1a8a361b619da52089e88a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD3 5244 bytes
font_01_sfnt_off00006e88.bin
a2fce36cf469b08655df01cd8eccf34d98d7e2d441c71c1a9d1d4655c91a299c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 11492 bytes

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