Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4abdc18cd50fe…

MALICIOUS

PDF

54.7 KB Created: 2020-08-19 18:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ece99438fae9696e58e8455997ed8e SHA-1: ccacd87751b9637e78dd401c108bc1dbdd1b90ba SHA-256: dec4abdc18cd50fe49bab61c334d1749055643ae29783bab5434c6c90f1005ff
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, which points to 'https://ttraff.cc/pify?keyword=scatter+graph+worksheets+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous embedded URLs suggests a link farm or redirection strategy.

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=scatter+graph+worksheets+pdf
    • http://regewu.watercolorcreativitylessons.com/uploads/1/3/1/6/131607240/4ea7fc32.pdf
    • http://files.andrewcollinsart.com/uploads/1/3/0/7/130776661/tiwovogituse.pdf
    • http://files.carrshieldcampingbarn.co.uk/uploads/1/3/1/3/131384113/sixuzakojam.pdf
    • http://xekesabi.marianocastano.com/uploads/1/3/2/6/132681670/rozupuk-gisegike.pdf
    • http://files.edgewaterva.com/uploads/1/3/1/3/131383541/mijufudezefabukuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/raviruxafugivegad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/73832343500.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/soderuxuj.pdf
    • https://cdn.shopify.com/s/files/1/0455/4008/1829/files/an_orange_for_frankie.pdf
    • https://cdn.shopify.com/s/files/1/0440/6539/0757/files/41581461343.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/pebilomaxenuxuvakudaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1495/files/weather_underground_knoxville_tn.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/sevifososokurowivik.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/62701940015.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/bridgewater_hall_seating_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/control_system_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/natefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.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/
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/soderuxuj.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009708.bin
34afb7820df311b74f71a3c2312fb0733dad6c8092214dbfecea0f8888906ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9708 5644 bytes
font_01_sfnt_off0000aa3e.bin
81b06a5babc0e8ebd4471b120f5c3be993268dba77cea5cad92a8efae00fdd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA3E 10488 bytes

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