Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fce331c40da3340…

MALICIOUS

PDF

58.9 KB Created: 2020-08-31 09:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3062edab8716b274085ea9187083dc61 SHA-1: aeef9de5fde9f5bdb8bb6e8f6eb7e9de0083370c SHA-256: 9fce331c40da3340fa5c366a9311c99e9525c491c1c88aff46d7b39edcfed389
152 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded external links, with many pointing to a redirector service at 'ttraff.cc'. This suggests a phishing or malware distribution attempt, leveraging a link farm to obscure the final destination. No scripts were extracted, and the document body is heavily obfuscated.

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/wix?keyword=nasikh+dan+mansukh+pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/discord_webhook_url.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/gegowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/exceptional_c_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/sefabomogaf.pdf
    • https://static.usrfiles.com/ugd/599f1c_635aa0879d264895bfc0992d960f47ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_8784e4fc0e4d4eb795ca514308fdd585.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf4ad27db42240518856e10e857cc8b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6860b9c7d6f949738318f04aabb7d47a.pdf
    • https://cdn.shopify.com/s/files/1/0464/1783/8248/files/sql_server_2005_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0462/2768/5525/files/new_balance_695.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/zitodu.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd06bd06baf434aa44f185218b28860.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2f3e755c7684819adf616f6772488ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d8407c9959e4ee9ae53b1189bb69f36.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b5bd.bin
2472743b5ef066144ef64ed78563509333a48aae976ba6d2ec6a92f3a02486f8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5BD 23280 bytes
font_00_sfnt_off00007cab.bin
331e3900af93c5b590027414e5cbbc80380245927d0342ffe375e368dd3fe5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAB 5188 bytes
font_01_sfnt_off00008e29.bin
3386fdc0d0c9e5ad7bfa17605010f625645e394a12aaed1a2bf0f261a6a6a2df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E29 12260 bytes