Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbd46d6d040af24…

MALICIOUS

PDF

56.1 KB Created: 2020-08-30 07:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d289693320813c4c7d619c03332d3428 SHA-1: ac91d334bf94b96aee560f21c2640663e0adc8a6 SHA-256: 7bbd46d6d040af2472a47d0cf3a73b55005db776746dde3b1ffc369ddaba3797
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains keywords related to 'affairs cloud monthly current affairs pdf in hindi' and the malicious URL, suggesting a lure to entice users to click the link. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=affairs+cloud+monthly+current+affairs+pdf+in+hindi
    • https://static.usrfiles.com/ugd/b8c837_e31d2145ce634a5995cfab1fcd8bc3e9.pdf
    • https://static.usrfiles.com/ugd/b42fd6_64fa1f77c8e648d8b053512da30db695.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bf6b409ea74fed8cf0887e40321912.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c21f3a9479542fc966c7fa7896050f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f83f012773864f15b88dd7246eeb3c87.pdf
    • https://static.usrfiles.com/ugd/5b5da7_237e7051272a458aa3430c371ae345c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e31703808bf4874b7dd69aadd26b9a4.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_03b3f1eae2a14709b0a40f30174cc5b3.pdf
    • https://static.usrfiles.com/ugd/7dd30d_81e182c2132a4ea1baabfc85a9ea4f00.pdf
    • https://static.usrfiles.com/ugd/b8c837_7245456b1c484ab19fe5659808f55a88.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/6978151439.pdf
    • https://cdn.shopify.com/s/files/1/0430/1147/3571/files/algoritmo_de_prim_y_kruskal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0485/files/21726514796.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/8b9728_bf37fd35ee6948869be4c224ba343943.pdf
    • https://static.usrfiles.com/ugd/dc98cc_5af87e070dc948d798277d2b274c544b.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_off000093bf.bin
a726b2fedeefca2ae7529d531c738471707f2d5ede52747abd77589554f9a239
pdf-font-stream PDF embedded font (sfnt) at offset 0x93BF 5484 bytes
font_01_sfnt_off0000a63d.bin
e2190937bdff08610b0ad047005e9d873ac0d394415792894a6a6dbc2cceec85
pdf-font-stream PDF embedded font (sfnt) at offset 0xA63D 14584 bytes