Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3efa79e2c9313d…

MALICIOUS

PDF

52.1 KB Created: 2020-07-20 07:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92b555708d84df0b95b552c2c47fc9ca SHA-1: ffc4942645e29ce16b8eb2c4153c16f5588861e3 SHA-256: 0c3efa79e2c9313d64e77206a32622828bd031aaf3a6b33bd3df35227ab08576
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests an attempt to lure users to potentially harmful websites, possibly for phishing or malware distribution.

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/wb?keyword=tommy%20emmanuel%20angelina%20tab%20pdf
    • http://files.marineryouthcheer.org/uploads/1/3/0/8/130813095/26ce2b455408ea.pdf
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdf
    • http://files.brazeldazzlestudioz.com/uploads/1/3/0/9/130969200/dalekuk-faburenoteje.pdf
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdf
    • http://files.californiaketo.com/uploads/1/3/1/8/131871621/ff7b1953.pdf
    • http://files.doublefoxx.com/uploads/1/3/0/7/130776877/masidap.pdf
    • http://files.musiccountsincanton.org/uploads/1/3/1/4/131408465/f511869c0.pdf
    • http://files.crystalspiritartstudios.com/uploads/1/3/2/3/132302768/7296017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dusikixitew.files.wordpress.com/2020/07/16580317294.pdf
    • https://nevopazadis.files.wordpress.com/2020/06/32130680132.pdf
    • https://duzedakizu.files.wordpress.com/2020/06/bilinekitaximiwebidi.pdf
    • https://kaxukowalu588706881.files.wordpress.com/2020/07/6687664925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/derulavod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/3426395403.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20116177671.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/xajidutezatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55497749658.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/wododowinavobaxazunuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/3120760891.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008087.bin
1eca8a97404df59e07f79903cbe821ff2389cd0b167ad36bf7769e5295aa2dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8087 5160 bytes
font_01_sfnt_off0000920b.bin
37310844c7dc00bcc3cb606d3d1d9ee3a4fbfd9627fdbdbd60ec705e81c48862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920B 15260 bytes

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