Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b26909da9da0f7…

MALICIOUS

PDF

56.9 KB Created: 2020-08-09 18:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aac07ff84f03b50340e4a86cb0d71ce SHA-1: f8acd1896365ae252d0829487f8554b6d393bb84 SHA-256: a8b26909da9da0f74beb3ce873c8c4cf1ddcc85aa343a1b88a33f064e9770d6a
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/pify?keyword=radiation+heat+transfer+siegel+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains this URL and numerous other links, suggesting a content-luring or phishing attack.

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.com/pify?keyword=radiation+heat+transfer+siegel+pdf
    • http://files.biblecalendar.org/uploads/1/3/1/4/131437680/gewuzovuparuxi_ragaxesanabi.pdf
    • http://files.manndiblecafe.com/uploads/1/3/1/8/131871705/889441.pdf
    • http://muzasoma.alicepyho.com/uploads/1/3/0/7/130775997/6839364.pdf
    • http://files.chillfitorlandopersonaltrainer.com/uploads/1/3/0/8/130874265/pefivirozi_wofudaxaxuguw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/10332807251.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/30508883868.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/65468147539.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/rasofotexuneb.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/68412310591.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/bemafuwenukolukuwirurirun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/58427319659.pdf
    • https://cdn.shopify.com/s/files/1/0429/6189/5587/files/84117294480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/90998991550.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/how_to_download_roms_from_emuparadise.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/76140187925.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_off000086bc.bin
2264e65db18f021894e51e89b09c01514273abde74c4b342bb754ed59ba2ce7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BC 5308 bytes
font_01_sfnt_off000098ce.bin
bccab2a38d85859cadcf2a4fc77d8312899bf8fe78cfe7f634597d00bd913786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CE 11056 bytes
font_02_sfnt_off0000be82.bin
d6fca425a6f94d93afde83ee6afac213460beec050db232cfdee3f15a94a99de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 16396 bytes

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