Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc55b4f1237db90…

MALICIOUS

PDF

40.9 KB Created: 2020-08-21 12:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c93d6c5502a26ef3325d6143e9789c39 SHA-1: ada27f50661da4510797805e8c4ce31bf70f5be7 SHA-256: 2cc55b4f1237db908b7b83e018ab24a65a6c777d9f1977b9da8dedc2d57f86db
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=ixys+thyristor+datasheet'. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=ixys+thyristor+datasheet
    • http://gawijud.marileevsmith.com/uploads/1/3/0/8/130813095/8645575.pdf
    • http://files.elyriadev-center.com/uploads/1/3/2/3/132303382/5a0aa.pdf
    • http://files.carolynbarlock.com/uploads/1/3/0/7/130776420/405468.pdf
    • http://poxapodi.lesmagnoliashotel.com/uploads/1/3/1/4/131438025/rasibuv.pdf
    • http://files.doublebeehoney.com/uploads/1/3/1/3/131384777/tasekuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/jazujusivuriwupadizilute.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/statistical_reinforcement_learning_modern_machine_learning_approaches.pdf
    • https://cdn.shopify.com/s/files/1/0428/2541/6860/files/36937248975.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/jilipeditovexe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7712/1686/files/law_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/80324124401.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/41626878392.pdf
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/23511072033.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/bodenigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/34556788571.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/nopolulinavud.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8023/files/41533434708.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_off00004fda.bin
8440a29180791adc70b1c67b9b969d779a1349a7aa835bc6b34d440189119b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDA 4672 bytes
font_01_sfnt_off00005fcd.bin
5b985c64d97da5652a17f1d56612db24a6123afca4a1145dd008d434940e1190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 12692 bytes
font_02_sfnt_off000088a5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 4324 bytes

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