Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1d483361f2b811…

MALICIOUS

PDF

52.3 KB Created: 2020-08-14 08:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2ff3764f66e47f80bef0efc1f7137a SHA-1: 84e82e463ba15ce7b31d02f4a4bba6e1677fd14a SHA-256: 6c1d483361f2b811c2a33c7084748b10d26fd0870bf535273cc3e4b3827ef32b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a redirector service, which in turn leads to a large number of other PDF files, likely for SEO spam purposes. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests an attempt to drive traffic to malicious or spam content.

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=sintomas+de+la+anemia+falciforme+wikipedia
    • http://kesov.cuttingedgepetservices.com/uploads/1/3/1/3/131398425/2379425.pdf
    • http://files.nextpromotionalproductsandapparel.com/uploads/1/3/0/7/130739713/2385699.pdf
    • http://files.anatomyalchemy.com/uploads/1/3/1/8/131871705/345013a61b2331.pdf
    • http://files.evelynsander.com/uploads/1/3/1/4/131438629/4166807.pdf
    • http://files.onefutureatatime.com/uploads/1/3/1/4/131438079/6787680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/gasepuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/boogie_oogie_oogie_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/dedafob.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/wausau_weather_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/16061518404.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/60437730261.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/mathematical_physics_drive.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/bitax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/ratomerivime.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/dozoxijigumavilorem.pdf
    • https://cdn.shopify.com/s/files/1/0438/1507/6002/files/75489646416.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_off00008b06.bin
eb6b653c91a3a8c0ad980491d54efffc346b1177abbf8a77c1c292ee2aecc6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B06 5560 bytes
font_01_sfnt_off00009ddd.bin
4ccad22559e0d11853ba75fb83789f1eb7316edb0ee104d576493f48b7cac0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDD 11160 bytes

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