Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfcda43ec225a5d…

MALICIOUS

PDF

48.3 KB Created: 2020-08-07 02:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2490adf36b95ebe2b6086a6565eeb091 SHA-1: dc9c40392f54430afb24b25d1a1b98d679850101 SHA-256: 0cfcda43ec225a5dfac38293eac7703e912a4c3a2484e0448f48176dfb93fa6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, though heavily obfuscated, contains references to 'argumentative writing definition pdf' and includes the malicious URL https://ttraff.ru/pify?keyword=argumentative+writing+definition+pdf, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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=argumentative+writing+definition+pdf
    • http://files.structuredevelopmentnw.com/uploads/1/3/1/0/131071145/nobolazow-tuxoxugep-mekazazufobi-puseju.pdf
    • http://files.dimotra.com/uploads/1/3/1/1/131164168/joxevuxiwozupoteja.pdf
    • http://files.a2consultation.com/uploads/1/3/1/3/131384081/kosilelov_zukozajawoxa_famuna_tiwaviralupom.pdf
    • http://files.albertastockdog.com/uploads/1/3/1/3/131380627/8078683.pdf
    • http://files.agileleantransformation.com/uploads/1/3/1/4/131453015/6faadffa6fa35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7276/5598/files/38866551768.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/17862379305.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/57717368555.pdf
    • https://cdn.shopify.com/s/files/1/0447/9169/3463/files/dubai_expo_2020_master_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/86981403814.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/workplace_health_safety_and_welfare_regulations_1992.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/sapovavoxunotameboxaliru.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/xoxofokesonu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/puwajamiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/85210391145.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7719/files/12892669526.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_off00006f5d.bin
8d0dc6591e39d22dff6ac1dfb39b05084114d7010c3cd411269c4e6ea155574e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5D 5176 bytes
font_01_sfnt_off000080f0.bin
126964bb2c820641d62960ee74e586b5ed6936541a634f20a31e1a931f924f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F0 11208 bytes
font_02_sfnt_off0000a615.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA615 4324 bytes

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