Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcfe7c347b2d4b1…

MALICIOUS

PDF

47.9 KB Created: 2020-08-23 08:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee81dbb089edd51af4cb1cce099add61 SHA-1: 9a9a80c375c6a13527fc43346359dcb2fbf406da SHA-256: 7bcfe7c347b2d4b191f85b21f29fd8fd967b383f0ad876850fd98a825abc2f41
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one primary malicious redirector at ttraff.ru. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=vscode+format+code+php, indicating a lure to a malicious site. The presence of numerous PDF links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=vscode+format+code+php
    • http://zudanev.lovingavonlea.com/uploads/1/3/1/4/131438556/jajosuwagewunuv.pdf
    • http://womoforag.nomadshockeyclub.com/uploads/1/3/0/7/130775354/wadabaxagajuf-sobuked-darezi.pdf
    • http://files.glampinginkent.co.uk/uploads/1/3/0/9/130969373/kasuratexonelo-wabalum-fotepateki.pdf
    • http://sesabu.thepaullindereducationalfoundation.org/uploads/1/3/0/7/130739777/4daba32d7.pdf
    • http://dutavo.ironcitysteelworkers.com/uploads/1/3/1/1/131163540/ripatalawusaxel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/5602078232.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/27116720015.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4744/files/jimudulerafaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/bulb_smash_2017_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/xejif.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/birth_certificate_amravati_municipal_corporation.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/dipen.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/86790735741.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/43530761198.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/basic_accounting_concepts_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/68542874423.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0466/files/essentials_of_understanding_abnormal_behavior.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/menejomepavafixajin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663c.bin
271f5413cec5190998082e4909e350bda68020e34fb4f380a48acb6ccffaafb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 3076 bytes
font_01_sfnt_off0000711e.bin
b0cde66a4ed770a3be49e2c5f8d2fb0d1e65fb8bd522275a891b32b33bc6ad9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 5328 bytes
font_02_sfnt_off00008306.bin
0cba946a1011763a5b3d0f440c704485f6d2ad2f79782fb9b8a000d9d1d112c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8306 2188 bytes
font_03_sfnt_off00008cd0.bin
e9901696d0e42193e0ce147eac1a90f2c7aeb2a7515fd1360ae7ec369d09c6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD0 10864 bytes

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