Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd379d8de1a0d45d…

MALICIOUS

PDF

47.7 KB Created: 2020-08-17 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb55bfcc2eea3fd467857bfe9db6c43e SHA-1: fc08bff91ee23538115bfe4aa66dc2a1443db3c9 SHA-256: fd379d8de1a0d45d2943ffdf65e74929a9bb233a524baec5d3d70ee79f0ebcec
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=manualidades+solo+con+papel+blanco'. The document body, though partially corrupted, contains the same lure text, suggesting a social engineering attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=manualidades+solo+con+papel+blanco
    • http://tixisuw.vafcs-aafcs.org/uploads/1/3/0/7/130739457/1919898.pdf
    • http://files.ownastandardbred.com/uploads/1/3/1/3/131398573/194353.pdf
    • http://files.murderhollow.com/uploads/1/3/1/8/131856392/piduxeb_noxoro_lamivalitutod.pdf
    • http://files.glenburnietow.com/uploads/1/3/1/4/131453623/detikope-gudakububoxew-bafumagis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/menunep.pdf
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/screen_kill_window.pdf
    • https://cdn.shopify.com/s/files/1/0435/8520/8483/files/is_mongodb_nosql.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/44868081083.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/naluvudivofusamewofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/papixusisijipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/47956382070.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/pipenejupedezigu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/xagadidugunag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/93865200245.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/xuregubiwetigamorudigaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/29307515290.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_off00006d2f.bin
59c7de08cfc5637a22763545ece150a72293a3dd7ec7c1f646dd7330654ba607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 4916 bytes
font_01_sfnt_off00007de1.bin
c529005b393c4674242986e3dcb958dabfc2c5a9068f5a3a0eeefd7eedbda72b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 11080 bytes
font_02_sfnt_off0000a1f7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F7 4324 bytes

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