Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfdfd90da60fcd1…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 09:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15f3b112ec18562bd2843b137941eb6 SHA-1: 0d7014af040a82b648a920257b68563d57a229ac SHA-256: bbfdfd90da60fcd1fd039a9e109507b6eafd4e1e639ddf46e5600cbf0d93596d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a tactic to disguise malicious activity within a large set of seemingly legitimate links, likely to evade detection or to appear as a legitimate resource. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=fly+sheets+for+draft+horses
    • https://cdn.shopify.com/s/files/1/0431/9612/1251/files/mechanical_measurements_6th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/zigekuzedeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/bible_study_guide_for_couples.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/jerumefen.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/24406685751.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/65171689576.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/xagawugu.pdf
    • https://cdn.shopify.com/s/files/1/0463/2585/8459/files/the_economist_july_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/regeroferiki.pdf
    • https://static.usrfiles.com/ugd/b8c837_45a26af347bf4cd48890df87428c8328.pdf
    • https://static.usrfiles.com/ugd/912de2_2752969cb00e453ca3ae5fb4ace59235.pdf
    • https://static.usrfiles.com/ugd/4cf28d_861f2754d7c04dffadb4030824b826d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a5556bc64c6445db763bc5047ee6aeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f775621edb54757a96cd4dce0144ffc.pdf
    • https://static.usrfiles.com/ugd/b8c837_43cdedc5c9ef437aaec158e14bc2b1c2.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_off0000717a.bin
4d7e82fabaa8ebea805d5f3229dbb7868914681854a6303e8568b4a6d8d54116
pdf-font-stream PDF embedded font (sfnt) at offset 0x717A 5052 bytes
font_01_sfnt_off000082ab.bin
fc48482ef50cb0ccc219dcacd3f90d7f4b37d39e1cc84d439dce4ea1399ceb74
pdf-font-stream PDF embedded font (sfnt) at offset 0x82AB 10324 bytes