Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9bebfd300a4394…

MALICIOUS

PDF

39.0 KB Created: 2020-08-02 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b57c77a3ab55dec2e4960fdba895e26 SHA-1: 99096ee72510ea017d88ae63340f03942f3b1396 SHA-256: fc9bebfd300a43940e1ea01ce15e16cb4fc9b9736d72ff7b7dd859b2d008b593
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the malicious redirector URL and numerous other links to external PDF files, suggesting a link farm or distribution mechanism. No scripts were extracted, limiting the analysis of direct execution vectors.

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=casella+and+berger
    • http://files.spraguescience.com/uploads/1/3/1/4/131437044/280413b67.pdf
    • http://files.socceriqeducation.com/uploads/1/3/1/6/131637374/a990ea207a8378.pdf
    • http://files.learninggenerously.com/uploads/1/3/2/7/132740480/fenadeji-palonapomeb.pdf
    • http://files.biomedlabs.org/uploads/1/3/0/8/130814124/tavagovoga.pdf
    • http://files.globalisationandcities.com/uploads/1/3/1/6/131607174/jilaxafufusekiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/xivagadezifanojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/waxadineritu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/nesovepiwivawav.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5247/files/2564416252.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/lubepuxawebibunis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/85499410024.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/increase_size_of_field_drupal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/mixenexon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kumug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/9925161665.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/litusapodiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/jogufufow.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/
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/litusap

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a1e.bin
4ee02fdfd0313fd24106a3390b31756577df4ede88b9ab195ff86bc438a37bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1E 5040 bytes
font_01_sfnt_off00006b41.bin
14a82e07207b6d98a5733dbcef7fe137609c31ff0779cb1166b08596317c3149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B41 10456 bytes

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