Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e99085326f31e6…

MALICIOUS

PDF

35.9 KB Created: 2020-08-18 21:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6235a230948d38654cfcbfe24fcb23 SHA-1: 14e35be415db2c77a263b910ab210ae872bfdc00 SHA-256: d9e99085326f31e6ce85db31bb8e0a58964e3f176097ad61209b27bf485c1321
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free content, specifically 'autograph tamil movie audio songs free'. This link farm directs users to a malicious redirector at 'ttraff.cc', which is a known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to a known 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.cc/pify?keyword=autograph+tamil+movie+audio+songs+free
    • http://giseji.gscmaine.com/uploads/1/3/1/8/131856919/belel-pigulezudetive-pilezu.pdf
    • http://files.genuinecollection.ca/uploads/1/3/2/6/132682076/wagezilek.pdf
    • http://files.laughlinlawofficellc.com/uploads/1/3/2/7/132711961/df2b0f9.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3777/files/biwenajara.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/33182543448.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/54874394832.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/let_it_go_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/4765353454.pdf
    • https://cdn.shopify.com/s/files/1/0439/6669/3534/files/alter_ego_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/bupilonumukuwaxenoxalovep.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/4th_grade_math_worksheets_packet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/66915608875.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/bofugodawizexiwomevilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/48515338163.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/4720919753.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/90807933939.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_off00004c8d.bin
a0dc6b7e26075da626b4318b8905c71ef7f456206254aa6519b1101af23733ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8D 5504 bytes
font_01_sfnt_off00005f2b.bin
0fdb230186dacbfcc683c5ad5f67f89e4cdd7fc00e1000c5e2d14e0cc35b0d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2B 10312 bytes