Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a4f4ce34dd2e3…

MALICIOUS

PDF

41.8 KB Created: 2020-08-16 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39809a89aa3469f197bd84b0abb7272b SHA-1: 83503922664a030dbedd33deb6bdf7a014e9b6db SHA-256: 8f3a4f4ce34dd2e3f16995bbca065a28b88402e533f380905c820a04b5ace82d
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it contains a large number of external PDF links, indicating a potential SEO manipulation or link farm strategy. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector URL is a high-priority IOC.

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=android+room+query+sum
    • http://sazoto.clintweiler.com/uploads/1/3/2/6/132681495/tesipaxawi.pdf
    • http://nuxiko.melindacochraneauthor.com/uploads/1/3/1/6/131606490/6029046.pdf
    • http://files.nickbrust.com/uploads/1/3/0/8/130814340/lekakaweviwiniz-bikig.pdf
    • http://takavad.delorisartist.com/uploads/1/3/0/8/130814017/tixelofuwus.pdf
    • http://nisewebu.w-here2stay.org/uploads/1/3/2/8/132814930/jobisogem-veduz-wuwexetos-bipifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/33593591752.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/s_letter_hd_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/clicker_heroes_save_editor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/20387709434.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/bafabopadunikapopafisa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/bosemeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/joxarinowudamas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/disij.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/advanced_java_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/fovugibasanetisakebun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/dulan.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/1773584352.pdf
    • https://cdn.shopify.com/s/files/1/0440/8436/3416/files/basel_1_framework.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/78694406770.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_off0000633b.bin
ff9e548df407783c604a0dae54c49266d5aacde3fd39bc9c8833d30e45be7119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633B 4948 bytes
font_01_sfnt_off000073f7.bin
be08ee107282cbcaf23fef127a252ff17c8d10def7d268c2285b99d2b96d9cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F7 11720 bytes

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