Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd30f1f465b1ed08…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 09:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd6e9dabebbdab386f00eb34cf6723e SHA-1: f630d41365802e9cf6c57ac864228f7a33cf55eb SHA-256: cd30f1f465b1ed08eeddf9dee9acd570900765258dad567a12620962c07a6aa7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a tool for 'xml formatter linux'. The document body, though heavily obfuscated, also contains this URL and references to wkhtmltopdf, suggesting it's a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO tactic to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=xml+formatter+linux
    • http://files.incredibottle.com/uploads/1/3/1/3/131398113/jiropeku.pdf
    • http://sopef.kellerdesignbuild.com/uploads/1/3/0/8/130814328/gofidarojudoridivit.pdf
    • http://vopaxixa.ladieslearnenglish.com/uploads/1/3/0/7/130738731/3389600.pdf
    • http://files.keithhankins.com/uploads/1/3/0/8/130814874/2432407.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/panotupid.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/13084199961.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/47691347999.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/kuvawozinagonumuputo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/65880782332.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/zenuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/36513720442.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/wugewulokused.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/67731891553.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/vert_shock_workout_free.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_off000061f9.bin
b78b0a2e8d7b04220ef3d792bb678ec24bbffaf23cb73f57bd995fe12f13888c
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 4780 bytes
font_01_sfnt_off00007220.bin
5fb62ff1ed13fe84f3bcba1d30f8b64b58ef5242593edcda0351429d617dbcac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7220 10976 bytes