Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2771bed96899ffb…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 08:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c346c7f386fb92b3913a39da7a4405 SHA-1: 7e85ab2bcae0fedb7f0b5fd63c2298055b05e2c2 SHA-256: d2771bed96899ffbf93f7aab973e06d61190aad5a0899da058193bdb9e889d66
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The document body, though obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=graves+top+build+guide', suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=graves+top+build+guide
    • http://files.laffertyanimalclinic.com/uploads/1/3/0/7/130775027/1774493.pdf
    • http://sapefo.jarrellfootball.com/uploads/1/3/1/3/131379179/vumapesixetonuk.pdf
    • http://legiro.thelearningrunner.com/uploads/1/3/0/9/130968931/5a284d6.pdf
    • http://files.blueblazeshoops.com/uploads/1/3/1/4/131452942/vepapusotewawu_buvuzati.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/noruzuzeliwuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/numetosu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/effects_of_alcohol_during_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/tuzupozebekotezada.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/seziborovexezowov.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/tigibaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/what_is_reliability_and_validity_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/nios_deled_final_marksheet_2019.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_off00005ff8.bin
df9c55c5a0b67ab3c36a2f0784eb9f3f16773761c1850d4c82d22726039bb0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 5356 bytes
font_01_sfnt_off00007243.bin
7d519323b11b54aa8609f9fa733e7e068a37e115593a2a127829436679995d6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 13404 bytes