Malicious PDF — malware analysis report

Static analysis result for SHA-256 544e0af2c103b9fb…

MALICIOUS

PDF

45.0 KB Created: 2020-08-11 11:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4eb7a10f7a43305298c1db84603acd SHA-1: b5c533f21ba93686a4d222c8eac414b09fbad607 SHA-256: 544e0af2c103b9fbd1021095607c8adec136fae89521c8278858beb9a6281ae3
152 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its extensive use of link farms and redirection to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL pointing to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The ML classifier strongly supported this assessment.

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=renewable+energy+and+other+alternative+energy+sources+pdf
    • http://sovobiz.infinitepillar.com/uploads/1/3/1/3/131380005/9328006.pdf
    • http://files.familypracticecenterofnewtown.com/uploads/1/3/2/7/132740285/cf11513.pdf
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdf
    • http://files.foxfiregalleries.com/uploads/1/3/1/8/131856446/gulidaxas-zurasa-tetidafuxizi-kelila.pdf
    • http://files.erica-baltimore.org/uploads/1/3/1/3/131381363/9391288.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/begomosogikufodamofej.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/runescape_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9728/files/95714773812.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/vodivuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/65775651417.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/bubble_sort_in_mips.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/banutorosesog.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/can_t_hurt_me_david_goggins_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/chabahar_port_vs_gwadar_port.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/83488404205.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/writing_fiction_burroway.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_off00006fdd.bin
3adf47b632ef87a661a11a6a1f9b4e59ff9ca8af785443cfe70fc31f8a2e4fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDD 5820 bytes
font_01_sfnt_off000083ba.bin
ec5648c5e0fbfecf1758b41c9b1e4cbf69e86b1f2bdb432a452f120cbd418d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 10136 bytes