Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881cf53ea325079…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a61920ccce624fb486e2c5e184521f SHA-1: 41ec50e731a958a0337ac1cd3bc40ac37a4f88cb SHA-256: a881cf53ea3250796cdd4e45fb629e8a2322c1603cc15a9c07ae14ccb626c7c2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a 'John Deere 1050 operator's manual' but redirects to a known malicious URL. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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=john+deere+1050+operator%2527s+manual
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/battle_of_the_sexes_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/adobe_editor_to_word.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/wukurewogofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6288/5541/files/able2extract_converter_free_download_crack.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/pekivupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/mathematical_statistics_with_applications_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1147/3571/files/mufilemafivisowopukerom.pdf
    • https://cdn.shopify.com/s/files/1/0448/5169/1680/files/clover_boot_flags.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/63673156852.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3073/files/76430185961.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/sslc_english_grammar_questions_and_answers.pdf
    • https://static.usrfiles.com/ugd/74a852_ed30f06b2ea6453cb17c9a76e5ebc8b1.pdf
    • https://static.usrfiles.com/ugd/08fe48_cc03ed462f3a471e988b87c9256f9278.pdf
    • https://static.usrfiles.com/ugd/9c43ec_becd39dd89a347538d32df3b1e95f5a7.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_off00004c51.bin
66553e1c907cc4c6b19e1349a05347ec4bb4b2e6f8dfeb4defaa7aa687d3afab
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C51 5540 bytes
font_01_sfnt_off00005f02.bin
f9ebd72f06a6ddbeea9941048c9882713ace065af247ca0417878a35327bc7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F02 9936 bytes