Malicious PDF — malware analysis report

Static analysis result for SHA-256 736504b5e97f0f44…

MALICIOUS

PDF

61.3 KB Created: 2020-08-10 12:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a08b9d1f9711bcdd1e744fe0cd94cf9 SHA-1: 62ab4db7c555fe015ee607814f6f8a34ada02f00 SHA-256: 736504b5e97f0f4479574ac486b34d387a5cec53755f9021f654d0bea4d07cbe
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a document about rational choice theory. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=proponents+of+rational+choice+theory+pdf
    • http://ruvab.lakeshorenursery.com/uploads/1/3/1/3/131383483/b39b7f.pdf
    • http://vagix.alessandrobianchetti.com/uploads/1/3/1/0/131071157/winofezax.pdf
    • http://files.blomgrentraining.com/uploads/1/3/0/7/130776407/7bf03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5188/4449/files/guzateginu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/nirugolusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/supome.pdf
    • https://cdn.shopify.com/s/files/1/0437/5298/0641/files/xamika.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/zovazixomodagipibipodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/37333701820.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/gelimifejesepiputukomim.pdf
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/12527802324.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/wizexaju.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/mathematics_for_economics_and_business_by_ian_jacques.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/53718448925.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_off0000b12b.bin
0e1779fe864abf9a61f4a3e92d5372d73550796e20116c8a41ace62dddb345b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 5348 bytes
font_01_sfnt_off0000c35a.bin
46980543b0a6f6852c8a97daa4b7dedb0f9dcadc22a64dfb979db54be9c74613
pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 11084 bytes