Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb1788bd37273f3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-14 09:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba7e2e7fda83f98b5f508194846c1e44 SHA-1: c37ce362947ece88cca1043c05f4efe52e842ad5 SHA-256: 5eb1788bd37273f311283457385874cdd51dffbc56110cf39dfeaca79b8e6ec6
162 Risk Score

Malware Insights

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

The sample is a PDF containing numerous links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=ats+bus+mods', which is likely used to redirect users to a phishing page or download further malware. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support the malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ats+bus+mods
    • http://files.welcomehomeuk.com/uploads/1/3/1/3/131397971/tawunot_mibutunitapefo.pdf
    • http://files.teddymountainny.com/uploads/1/3/0/7/130738875/0a353b79a3f728.pdf
    • http://ralawibom.bcarterartanddesign.com/uploads/1/3/1/0/131071243/wedilibagalesag-vekosikeg-lebetazatonu-zamirobevut.pdf
    • http://files.chg-advisors.com/uploads/1/3/0/7/130739415/moziwosof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/rogue_5e_swashbuckler.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/36348664443.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2711/files/twilight_breaking_dawn_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/bufejopuzavokimej.pdf
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/sepadejupugipesitedepor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/52559776439.pdf
    • https://cdn.shopify.com/s/files/1/0438/3598/1974/files/psychologie_de_la_vie_amoureuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3718/files/momavawelexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/getenugarikadafoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/tuvulawibamexe.pdf
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/adding_like_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/venice_map_attractions.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_off000075ea.bin
107717f63bb8ddf57e8be4ed19d097c1cd59afb9273ed9c4cfc1ba9104c02c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EA 4764 bytes
font_01_sfnt_off000085fa.bin
1250607ec496d5247a07540b04a9f4ad5af22d54f6da060f69e88fdedcf8acb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FA 10408 bytes

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