Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1f93b05b7393ff…

MALICIOUS

PDF

44.6 KB Created: 2020-08-04 06:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332873db177532fe01a250445edabe67 SHA-1: cc303e1040e5f908be9dc5c608fdffb4db3de91d SHA-256: 1c1f93b05b7393ff27880c9ce591f648f3f2db8699ee294473340291d9edc449
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=amarula+cocktail+recipes+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended destination for the user. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to obscure the malicious redirector.

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=amarula+cocktail+recipes+pdf
    • http://files.joinfacet.com/uploads/1/3/0/7/130739212/walewowez-mojimukisijazu-nizofuwupito-fusewapikeribog.pdf
    • http://files.mpps.vic.edu.au/uploads/1/3/0/7/130776591/7878308.pdf
    • http://files.thesarumleague.com/uploads/1/3/0/9/130969148/budotedufotalu_wavukunirez_tunegegeke.pdf
    • http://files.excellenteagle.com/uploads/1/3/0/8/130814043/kinadotaw-samuvom.pdf
    • http://files.mathwitheeesinc.com/uploads/1/3/0/9/130969874/2457811.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/xojisavutorivipabinis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/30061898743.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/elementary_statistics_triola.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/www_myfbmc_com.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/nilibetazerutafiwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/jilulezomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8140/0469/files/wuzudure.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/60969363194.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/1161256263.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f98.bin
0e58f0f131c6ea8f10675fdec5253e3a450693d19c530a23ae9935a442b635ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F98 5356 bytes
font_01_sfnt_off000081b4.bin
725cc44081b9ca4453b55687072dc783ba2676f213c2347a3fd3787b7abde1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 10456 bytes