Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a2a13c7ac85c7c…

MALICIOUS

PDF

43.1 KB Created: 2020-09-01 09:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9bd1f73567fc449486898329922fa8c SHA-1: 129069c1dcd7a9769ca7a48a2e21d8ae8634ece8 SHA-256: 13a2a13c7ac85c7c42a0a173a35aac89490ab5e00462f37e60c282f400b480cb
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a case study on leadership, aiming to lure users to a potentially harmful website. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. 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.me/wix?keyword=a+case+study+on+leadership+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_d3c2845f2aaa41ab86eed1bb345d4214.pdf
    • https://static.usrfiles.com/ugd/4117a9_cc084d7cf6f24b0eaed6809b9d760a87.pdf
    • https://static.usrfiles.com/ugd/b42fd6_2d3a0e1575b24ec99437a46f7f80608c.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/85881664479.pdf
    • https://static.usrfiles.com/ugd/e2f197_6bd2dbff5923495b94d54bdeebb4dd5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_575eeb01167d49938156ad861ba7b5be.pdf
    • https://static.usrfiles.com/ugd/e6092c_a82921d0d6454be19381a74a614c6174.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/bhagavad_gita_book_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/7191/7471/files/hernia_umbilical_sintomas_en_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/72840382882.pdf
    • https://cdn.shopify.com/s/files/1/0459/1249/0133/files/87140132906.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d38.bin
aa648be15ef477f9e460ea1d8a728fb6ca9be2c6d62932ba7dacf35856feb5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D38 5216 bytes
font_01_sfnt_off00006ee8.bin
0ff4c64cdaa6f8005d48b48124f19d31c590cd38241f2b66ddc6f8066a1d80d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 10208 bytes
font_02_sfnt_off000091cc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 4324 bytes