Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafb24a184da1328…

MALICIOUS

PDF

45.8 KB Created: 2020-08-25 08:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82fd85207632235989a4c151273980d SHA-1: 01242e9822b5b1acdda764e49f864d03c8044632 SHA-256: eafb24a184da1328a6ec7a3f593954cb8fbbb3856dcb52c12b05383031ff9ed8
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed to mimic search engine results. The primary malicious link, 'https://ttraff.ru/pify?keyword=bosch+microwave+oven+manual+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other PDF links.

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=bosch+microwave+oven+manual+pdf
    • http://files.theoxfordscientist.com/uploads/1/3/1/3/131380175/8582850.pdf
    • http://vuwomozu.artculturevs.org/uploads/1/3/1/3/131379394/debazemololumobug.pdf
    • http://liboles.thejournalofpolitics.org/uploads/1/3/0/7/130738884/mekozadegan-gedosukodi-vikovaj-tedajinimixa.pdf
    • http://files.sweilab.com/uploads/1/3/1/0/131070137/vigekikogebup.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/dnd_5e_way_of_the_long_death.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44628440260.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/pizevulufepafav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9093/files/bloons_td_5_mod_apk_lenov._ru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/alice_in_wonderland_novel.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/wavobedimokuwutumezaximuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/18500064919.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/dabepipavusalitox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/31069686650.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/39308060907.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/latov.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_off0000756b.bin
12b10377975d0d5746f24285c707b15b2e3011853262722f9536e8af7f9eebb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 5596 bytes
font_01_sfnt_off0000885c.bin
1da548f1250050f4480fad402d27ca4b73cb359efd85556d91ba9b4bf3e3cd0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x885C 10008 bytes