Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71cca83286f7496…

MALICIOUS

PDF

49.3 KB Created: 2020-08-04 01:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e97e67797a31801a6ac0a53f839863b7 SHA-1: f759ad9d7419b1f5ab5f33870312ad0294690e3e SHA-256: f71cca83286f7496839b66e96bb761ef9d2e1779ad45487e4d656ee92a90a9bb
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains multiple embedded links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=alchemy+emperor+of+the+divine+dao+%25E0%25B9%2581%25E0%25B8%259B%25E0%25B8%25A5%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary attack vector appears to be luring the user to click on the malicious redirector URL.

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=alchemy+emperor+of+the+divine+dao+%25E0%25B9%2581%25E0%25B8%259B%25E0%25B8%25A5%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2+pdf
    • http://vivopo.petravb.com/uploads/1/3/0/7/130738779/xakalil.pdf
    • http://files.charmingandchair-ished.com/uploads/1/3/1/6/131636642/a0982758cb.pdf
    • http://files.andrephotography.net/uploads/1/3/1/3/131384301/jisenema.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/nurewapopinasaxeberoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/does_cracking_your_knuckles_make_them_bigger.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/fugoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/tupac_alben_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/xifuwufaxoketapapavotesuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0179/7019/files/mifawevofuzikulimos.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/80880498020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/bukodil.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/26329614577.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/14589030341.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/iguana_tinker_tweaks_config.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1581/files/44743575877.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/degises.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_off00004f2f.bin
fcd997b58604de2ebc59ed83301ec530e0ead6a6a2db641294e2fcf9ebdeb479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2F 5368 bytes
font_01_sfnt_off00006150.bin
85c53b513902abb9bc2e0ec8b956943455f449ba20940acf1af888d487edc09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6150 6904 bytes
font_02_sfnt_off000072f5.bin
065c4b7fe1d60de50b076f4c989afccd18de19296347539f6633870ee0ebb971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 7012 bytes
font_03_sfnt_off000085e1.bin
0e8d18a2a9697a48ede09d9272ecebeca2e9598786bc6c0f5d9c9c4c9d159b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 15172 bytes

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