Malicious PDF — malware analysis report

Static analysis result for SHA-256 141bcc635e84f3cb…

MALICIOUS

PDF

46.2 KB Created: 2020-08-11 16:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ec1bd0cfa6c1754f8395bcf4a8e8e4 SHA-1: 75c46051c6ce4899aa552c8eff1cb04d0bd68a05 SHA-256: 141bcc635e84f3cb5362d51c2841f159b77dc78f7ad6585c38a3204e4586a1a0
162 Risk Score

Malware Insights

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

The PDF contains a deceptive title related to 'national income' and embeds numerous links, one of which points to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=method+of+calculating+national+income+pdf
    • http://files.beyondbonesapparel.com/uploads/1/3/1/4/131408017/xasusorajakanuja.pdf
    • http://files.monmouthmethodist.org/uploads/1/3/1/4/131437680/wemuperawewaso-gitidavejep.pdf
    • http://files.in-fashionacc.net/uploads/1/3/1/0/131070689/85e4d75b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/62597114372.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7885/files/guxeliwoletuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/78154764729.pdf
    • https://cdn.shopify.com/s/files/1/0443/0092/7132/files/rofawinujarixusajul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/fovabezusox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/kekozekejibagejipok.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/20279079675.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/nolodogabejozavabav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/1156414881.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/danufopug.pdf
    • https://cdn.shopify.com/s/files/1/0437/0736/7592/files/jowavajefigifevuvun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3170/files/can_ps3_play_ps2_games.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/15292618237.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_off00006819.bin
8e4e3b855c77145531d1be493b289fa985b0429d45ccc62a5fbdc26c8ff3d09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 5184 bytes
font_01_sfnt_off0000799a.bin
6668d3cfcbc287620ba14c2d4ed9dcbcb2207f7e4fc0d62ad1dce1a76e60392b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799A 10524 bytes
font_02_sfnt_off00009d8b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8B 4324 bytes

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