Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeaeccd085c25700…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 05:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee88963c6680790fc45d6d9c01e8fca SHA-1: ee238cc06e22a54403b75641c69bfeae475c0435 SHA-256: eeaeccd085c25700653c86afdd1d3694b1a362c2526c3c69ba1b420d57768b4a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=calculus+of+variations+springer+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=calculus+of+variations+springer+pdf
    • http://kepivuvam.crossfitremix.com/uploads/1/3/1/4/131453247/ruwabaje-fugoku.pdf
    • http://files.cleftstrong5k.com/uploads/1/3/1/4/131408245/lisolokikumisar_timixulaz_dezadazonowepef_tetoxafegat.pdf
    • http://gosofepe.bettysbunch.com/uploads/1/3/2/6/132680866/ce4ea9.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/anemia_peru_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/taxege.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/25787762861.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/davojiduwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/lefudojudatexosulega.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/vawejolupodafinajokazobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/87744318391.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/avi_movies_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/13310898641.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/wipadajagonemi.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/bodybuilding_diet_plan_for_mass_gain.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/babalusivakolirenagiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/when_does_tentacool_evolve.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_off00005e8a.bin
832b0e1b76d7c354766a86a9e3973204a7b5b6c23c6290428aa84a3b9007b52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 5288 bytes
font_01_sfnt_off00007094.bin
85bcf634a4ea807dcc6573c4f1239d043ff0f603be13089978f133c32975cb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 9992 bytes
font_02_sfnt_off000092b8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B8 4324 bytes

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