Malicious PDF — malware analysis report

Static analysis result for SHA-256 1177c9af589d7f3f…

MALICIOUS

PDF

35.2 KB Created: 2020-08-03 12:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00464d7408a5938562cc93411f7bbc02 SHA-1: da24db6bdca8f85a53705e5811d51b4d0d820136 SHA-256: 1177c9af589d7f3f2ba7dc06a5c735240ee3a16917ec55c8f84186135e6b9e91
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 a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational materials. The ML classifier strongly indicates maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site.

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=cambridge+o+level+maths+past+exam+papers+pdf
    • http://files.klineglazeservice.com/uploads/1/3/0/7/130739522/wevevota_magofegasuf_bufifunus_rurepu.pdf
    • http://files.creativeclayforall.co.uk/uploads/1/3/1/4/131407111/nugugilaxi-wuxev-zimalesepe.pdf
    • http://files.oakfurnitureyorkshire.com/uploads/1/3/1/0/131071167/volijudap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/xewebukivodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/47370854021.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/sedona_10_day_weather.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/68499679817.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/xajudolokinirewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/highschool_dxd_manga.pdf
    • https://cdn.shopify.com/s/files/1/0433/2496/5019/files/mcquarrie_statistical_mechanics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/kuxupimajafitibupel.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5501/files/ti_83_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/25834311505.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/9610337715.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/gubojiruvakav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/litekerivekizuxu.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_off00004935.bin
19b78eb1cd48eba1ed1140999e0d0d9a6f92da5328a4914340301a009fbdd4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4935 5628 bytes
font_01_sfnt_off00005c2a.bin
9e85b2ac366e1c1e464ffb17852b23edcd721980d1b94afd739ea2d45b98477a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2A 10436 bytes

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