Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2f46acd7eabc14…

MALICIOUS

PDF

37.6 KB Created: 2020-08-28 13:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f833ef498187d72716b0cb52bcb360 SHA-1: b8dca12a2057fc310dd078c137f860f2a64d16d6 SHA-256: ca2f46acd7eabc14409c00ebf0a9e836ec73317f53b9d0ce637dd425022287a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=index+chaos+8th+edition+pdf`. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including the identified malicious redirector, strongly suggests a phishing or malware distribution attempt.

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=index+chaos+8th+edition+pdf
    • http://files.zennarobarbara.com/uploads/1/3/1/4/131406558/8757112.pdf
    • http://zofun.kumquatcoffee.com/uploads/1/3/0/8/130814328/5231571.pdf
    • http://files.thehumblehumanist.com/uploads/1/3/1/4/131437474/5412546.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/ielts_band_7.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/30588682268.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/40887387424.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/arabic_to_urdu_book.pdf
    • https://cdn.shopify.com/s/files/1/0458/5432/6937/files/asexual_reproduction_by_spore_formation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/science_fusion_grade_4_teacher_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/fortnite_template_for_cake.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/fixufuxagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/10543916685.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/83777821432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/fosuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/43735684262.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000541e.bin
23ba441c6256032f56d014fd8c6a7a0e0a0a12e8bd3a5f4d6470432c45016809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x541E 5312 bytes
font_01_sfnt_off00006630.bin
9732b07b74340f5536f9f3c554ca2807f2db0299f32f5ee701de1ab5bdea3d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 10420 bytes

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