Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1ae1745672e6c6…

MALICIOUS

PDF

45.7 KB Created: 2020-08-04 21:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e7a0115fb189b5251baf7ae031ce66 SHA-1: 389610390c4a5c19267375b9d5bfbb09a342c980 SHA-256: 6a1ae1745672e6c6d880c94a2a7cbeefb4eb1941004542a71d2ec8fd0f437b61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm.

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=appareil+genital+masculin+et+feminin+pdf
    • http://files.grasshoppervapesllc.com/uploads/1/3/0/7/130739480/zuwapizunez.pdf
    • http://files.brinccborneo.org/uploads/1/3/0/7/130775462/rufaput.pdf
    • http://files.tctinternational.net/uploads/1/3/0/8/130874587/welofipeje.pdf
    • http://munodobe.robirving.ca/uploads/1/3/0/7/130739553/1817515.pdf
    • http://files.thedetailors.com/uploads/1/3/1/3/131384605/6264439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/28688700894.pdf
    • https://cdn.shopify.com/s/files/1/0428/4825/6156/files/toliwutekivow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/6707536609.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/winameloretegejifuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/21218775917.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/83717426057.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/guzakalim.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/95149889910.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/fivisuxovoderidupix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/16088614978.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/80872446359.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/rufajefigeg.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_off0000619c.bin
9c65130c885396c6bddb521997041b59d8191058088e58170a9397d88f94b2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619C 5236 bytes
font_01_sfnt_off00007349.bin
74cbcc0bbfc99085c46a3823aed81634553054ad14c6b009dd5966b65d6fbc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 12340 bytes
font_02_sfnt_off000099dd.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DD 4324 bytes

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