Malicious PDF — malware analysis report

Static analysis result for SHA-256 8139ad16512b9100…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f84802dad2869ce726d5036f76d8c08 SHA-1: bc3beeea3729236a8d1fec836420fa10fa497fe3 SHA-256: 8139ad16512b9100415f227a13f9b0d5c8b9a23c990c7b2c8d8fbf12c503671b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to jokes and embeds a large number of external links, including one to a known malicious redirector. The ML classifier strongly indicates maliciousness. The embedded links, particularly the one to 'ttraff.com', suggest an attempt to redirect users to malicious infrastructure, potentially for further exploitation or phishing.

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=funniest+joke+in+hindi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/advanced_accounting_theory_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0463/1130/9469/files/keto_diet_and_intermittent_fasting_p.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/zinekugodiragiko.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/27127474212.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/34474527468.pdf
    • https://cdn.shopify.com/s/files/1/0460/0142/2497/files/atualidades_2019.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa0bf9df090c4e56be2e4ff7179d123a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d641b0025714ec3a1553e02e6d82d34.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff46c4a69464428d8550cc546ebdd00c.pdf
    • https://static.usrfiles.com/ugd/b8c837_27658155b2dd4e2f99d7be761abcca94.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/helminthology_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/67564175643.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/55537071461.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2374/files/32871366562.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_off00005cc8.bin
0e7ea0e799b55609c2985904f5771effed21d5931a05f97b0ae74f8555b2ce75
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC8 4668 bytes
font_01_sfnt_off00006cae.bin
3ef46f2bad8f4a3e7b3cbe8b4897d456b0faadc26fb3699746d7f4adb1109403
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 10604 bytes