Malicious PDF — malware analysis report

Static analysis result for SHA-256 b352f5d409da1e92…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 20:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebfd30668101840d9647c78325e180d7 SHA-1: 9ae5ffa3d0bca7b2092c79d661f9a02d8fd58525 SHA-256: b352f5d409da1e92e2d27cc240a61cca0f549cbea71217e25997c6bdf3bdd854
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the primary one being 'cdn.shopify.com/s/files/1/0433/8286/6072/files/xijigozefotidivowixalelu.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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.cc/pify?keyword=carpenter%2527+s+blocks+1.+7+10
    • http://files.newjerseypoolrepair.com/uploads/1/3/1/3/131380126/2818747.pdf
    • http://files.celestecrystals.com/uploads/1/3/1/4/131408798/9c1615df497.pdf
    • http://nopivu.paolocroatto.com/uploads/1/3/0/7/130776054/vijalawudutude.pdf
    • http://fetixilus.embodylifeyoga.com/uploads/1/3/0/9/130969690/b898176f5b8.pdf
    • http://bitaxap.tonyswartzlaw.com/uploads/1/3/0/7/130776702/dezogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/xijigozefotidivowixalelu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6865/1680/files/96534836018.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/vyapam_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1586/4473/files/ring_of_blades_ds2.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/weed_eater_push_mowers.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/traduction_anglais_franais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/purovipixalas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0101/files/kojajiditemogeliwimuwes.pdf
    • https://cdn.shopify.com/s/files/1/0440/3852/0997/files/between_the_sheets_phrase_meaning.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_off00004e82.bin
fdb174badde18530b24d93424f33d1ac92abbb1b88fea7d26455cf0cdbf3b407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E82 5376 bytes
font_01_sfnt_off000060eb.bin
efae2e37f35827af7c4386d686f9cb768d5c73c6310d49b4e9c2e3368f41faa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 11204 bytes
font_02_sfnt_off00008617.bin
6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 16064 bytes

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