Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e062f1f5577341…

MALICIOUS

PDF

41.9 KB Created: 2020-08-10 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d78a556f0c66506c091905adb3d37d SHA-1: e0c7fc6c98422b2aedd35886c6b1652f0a171eb0 SHA-256: b3e062f1f5577341564502ecd358d23eea3c137ada82526adead65209856f25d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, forming a link farm. One of these URLs, 'https://ttraff.ru/pify?keyword=computer+lab+design+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the attack pattern.

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=computer+lab+design+pdf
    • http://ruseliwol.clanfieldprimary.co.uk/uploads/1/3/0/8/130873851/6043b26.pdf
    • http://files.himalayanadventures.net/uploads/1/3/2/6/132681452/5535711.pdf
    • http://jotejitid.rebeccakautz.com/uploads/1/3/1/3/131383775/jafezimewugit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/loweporeniwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/zanowovixokatarajosa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2243/files/mathematics_standard_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/41030328217.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/ornamental_plants.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/28573580647.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/53413911334.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/behavioral_patterns_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/xevuwexurifewukopidebivut.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_off000066e2.bin
9c2927758b3a3ea436ad823a65023639df49d5f9cf6bb3ee8990c7811a624844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 5404 bytes
font_01_sfnt_off00007919.bin
3075082e4353c5ce407c38e0b4a1bf16bc11a45ab52ecd6a85f43c33e942060e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 9968 bytes

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