Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f87b7dc672621b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 17:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9a11b2e36cde10ddbad50f53013822 SHA-1: 042a25930e25363605cb3b97429eea9c69f8595e SHA-256: f4f87b7dc672621b00b61b839557a435b44a5540f936a7b59f4355f1e2c2525d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL found in the heuristics. This indicates the primary goal is to redirect the user to malicious content, likely 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.cc/pify?keyword=antecedentes+de+la+administracion+de+compensaciones+pdf
    • http://files.newjerseywritingalliance.org/uploads/1/3/1/4/131437822/cd3bdd.pdf
    • http://jujexeb.mcqueenbc.com/uploads/1/3/1/8/131856725/bilapiluve_lenolirukaziro_pijirok_regeku.pdf
    • http://files.restorationchurchashecounty.org/uploads/1/3/1/8/131860645/8929902.pdf
    • http://files.margiekorrison.com/uploads/1/3/1/3/131384113/xakomuzapipuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/survey_of_clustering_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/42567363961.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/vertical_jump_bible.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/public_finance_in_theory_and_practice_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/95267055635.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/easy_cake_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1671/files/pelilisebusewidapir.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/c_vs_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2093/files/zutun.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/how_to_write_a_character_witness_letter.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/sinunibogovuwerug.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_off0000649f.bin
e8e7b8b21945e56ee0c6abedca6fa05cfb907178e997888f14015b3e89b4e385
pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 5288 bytes
font_01_sfnt_off00007685.bin
c1feae633cbefc2cd08ebca928d33983924a4d19dc37b0a7e7b81ecf87d5ff13
pdf-font-stream PDF embedded font (sfnt) at offset 0x7685 10944 bytes