Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab408af74c5825e…

MALICIOUS

PDF

34.6 KB Created: 2020-08-08 15:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4346a1e15d8eaa3ed95e0eb13f2d4f SHA-1: 86d43c167da42b1c6e9815082da494484e34193b SHA-256: cab408af74c5825e0d86afe22e01b504bbcdbc3b3091396c63a6608cf3b63881
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=kannada+opposite+words+list+in+pdf
    • http://fewawoje.classes.interactive-maths.com/uploads/1/3/0/8/130873995/5400375.pdf
    • http://files.pklblwinners.com/uploads/1/3/0/7/130775431/829e0be5b.pdf
    • http://xeguzufu.horticulturalpruning.com/uploads/1/3/0/8/130813528/f0c9cf6287.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/answer_to_job_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/gerawulizonolamav.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/48090655854.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/is_svelte_ready_for_production.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/golemowezizitofadinimevi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/30026219661.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/banking_and_finance_b._com_part_2_notes.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/81988296546.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0577/files/51917420470.pdf
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/libro_catecismo_catolico.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/mahishasura_mardini_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0439/3133/6859/files/list_of_commands_for_command_prompt_windows_7.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_off000041bf.bin
9cf2ff5bcea619aa359e5733bfc102ee9c4381251d6645c3b74a2eed5d36f555
pdf-font-stream PDF embedded font (sfnt) at offset 0x41BF 5096 bytes
font_01_sfnt_off0000533c.bin
6dd383aa435e84fcbfe22990b3da61af1d617834b79072d9e986800d8b0a0f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x533C 12912 bytes