Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8e1b233031fc1c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 04:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ddffb32ad23b1db15fef7e7c13cd4a SHA-1: 375ee6465ef88a4f5ad5a59a619d82e29a16b932 SHA-256: de8e1b233031fc1c6a0a30dc6953c29331e32f0e834447753e26543c13a31cb0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or content distribution scheme. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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/pify?keyword=aime+cesaire+poetry+and+knowledge+pdf
    • http://migimixu.building313.com/uploads/1/3/1/3/131383651/ligixukib-nofewinaje.pdf
    • http://files.asapsignsmi.com/uploads/1/3/0/7/130776673/xakavazekotadog.pdf
    • http://files.boonahartsociety.org/uploads/1/3/0/7/130776619/nugixuderijanamonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/professional_business_email_writing_examples.pdf
    • https://cdn.shopify.com/s/files/1/0438/1756/6368/files/canon_m50_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/25838078120.pdf
    • https://cdn.shopify.com/s/files/1/0436/5480/7717/files/concise_guide_to_jazz_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/83508410484.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/90190641724.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/94367277645.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/34173517645.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/genetic_algorithm_nptel.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_off00006a6e.bin
e196bbbbd231d1a7532f85681c1ed6e9ed84f1204facd5a941f626b179c32c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6E 5720 bytes
font_01_sfnt_off00007de4.bin
2a9773f4f0ffa86a1bb1723c01370a9b90e22429ab637f50c5eb2bbffba767bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE4 10536 bytes