Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5d06faa60b3c7…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 05:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9fc76825c8a200527268b01408e702 SHA-1: 905f7ceabc77ff08c47d0f2d3a9a08ba17144318 SHA-256: fad5d06faa60b3c79a9267af7f3f563d1b8632a0e1c2f1ba9104ce58035dbbe0
152 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. This suggests the document's purpose is to redirect users to malicious sites through a deceptive 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/wix?keyword=memoir+examples+for+high+school
    • https://static.usrfiles.com/ugd/8a419d_813dd33e60e1409ab9fb1b9ffd90f3ab.pdf
    • https://static.usrfiles.com/ugd/0047a4_0384bd3b0433493298ab17a55c3801c6.pdf
    • https://static.usrfiles.com/ugd/fef806_27b6a92c5f554e6c9fb6d965fbba9f61.pdf
    • https://static.usrfiles.com/ugd/4b7290_4ae6e1d7214d46d5b2cf8d1fedc0f9a1.pdf
    • https://static.usrfiles.com/ugd/10a4aa_e9a2f9b3020d4eb78de845e17f8db724.pdf
    • https://static.usrfiles.com/ugd/b8c837_d99d9feb1f144681b9db795ef12f9348.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/aircraft_structures_for_engineering_students_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/amalina_full_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/14518707438.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6945/files/10881189462.pdf
    • https://cdn.shopify.com/s/files/1/0465/0536/1566/files/articles_basic_rules.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_off00006f55.bin
dca06fd2cba16d830b59fdfef883a3c941d12d07b8f7579d29c4ce0eeb318d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5500 bytes
font_01_sfnt_off000081f9.bin
d3e373d9af1b510a1ca2b8e464d432ee0c9a872deb427a49939fa0b97f1f78d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F9 10204 bytes

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