Malicious PDF — malware analysis report

Static analysis result for SHA-256 1408f162ac13ee6c…

MALICIOUS

PDF

52.7 KB Created: 2020-08-10 11:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af508bd9e92772b32b2e8a86630a6df6 SHA-1: ad321f0eddcdd5480f5c7b82eb9a4b113f7add52 SHA-256: 1408f162ac13ee6c2e229798ff739b4628c36228729a14c6782ebee987a2878d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body itself is heavily obfuscated and contains the malicious URL, suggesting a phishing or malware distribution attempt.

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=smaller+pdf+size+acrobat
    • http://files.saintalphonsusschool.org/uploads/1/3/1/8/131857071/b41fba5.pdf
    • http://files.grahamvangoffrier.com/uploads/1/3/2/7/132712129/gusemogikaxamu.pdf
    • http://files.yogaforkidsportland.com/uploads/1/3/0/7/130739081/2908996760956.pdf
    • http://files.timferriss.com/uploads/1/3/0/7/130775701/wawabofa-xabaf-mowojibebid.pdf
    • http://files.blackmonmarshall.com/uploads/1/3/0/7/130776646/xafasuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/68302464887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/vacaciones_de_terror.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/80018020485.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/32516646433.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/mifajuborav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/zunetebafevujexakafar.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/lofuwunatiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/felega.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/waxaxuzuriwen.pdf
    • https://cdn.shopify.com/s/files/1/0448/0811/0242/files/amlodipine_norvasc_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/51616585246.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/xasapesalafovuzij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008286.bin
4ad0396def5961ec3f75a5eefb4a686b2481ef4656df14ca82706487310f0b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8286 5276 bytes
font_01_sfnt_off0000946d.bin
82324f6460b5d86cd72ece7aed22db88a879cdb1058ae0cdd568b8a35f17a835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946D 10368 bytes
font_02_sfnt_off0000b760.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB760 4324 bytes

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