Malicious PDF — malware analysis report

Static analysis result for SHA-256 86436bc1253de693…

MALICIOUS

PDF

54.9 KB Created: 2020-08-22 01:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4eb38ffeaec443e1fd47b4b09a2347e SHA-1: e0ed5e56aa08153f42b274d53f28d84d4e9a8286 SHA-256: 86436bc1253de6930afd77b92a136fdc74001b8da22fce7b5f072356fa908fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=fidic+quick+reference+guide+yellow+book'. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of numerous external PDF links, many pointing to benign content, indicates a link farm strategy to improve SEO and potentially mask malicious activity. No scripts were extracted, but the malicious URL is the main indicator of compromise.

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=fidic+quick+reference+guide+yellow+book
    • http://mebevaxe.bezaleelbows.com/uploads/1/3/1/8/131871721/8c76d693b82946b.pdf
    • http://files.marco-mazzini.com/uploads/1/3/1/4/131437229/a6421d94c.pdf
    • http://files.justinpearsongalleries.com/uploads/1/3/2/8/132815015/7302710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3355/8172/files/18th_amendment_pakistan_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/catia_v5_manual_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/bugelokujenezuxidu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/99168081785.pdf
    • https://cdn.shopify.com/s/files/1/0451/1842/3194/files/metamorphosis_in_arthropods.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/tratamiento_absceso_hepatico_piogeno.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/korased.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/88146711458.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/dovem.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/sportsmans_guide_visa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c20.bin
073a8320b14f820a1719f31bfb0f35647dcb95fdd4f3d952e004bacc1360f0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C20 5080 bytes
font_01_sfnt_off00009d7c.bin
2d5e5914221a9fb8e53610852a00f97dc3054f668a0b385da0efdbcd04a7178e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7C 10276 bytes
font_02_sfnt_off0000c069.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 4324 bytes

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