Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aebbe5f24ef5c89…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b896755872bf5aaef8b656d37d3f09 SHA-1: bc82a132b995b28bc190d7b24c58b66899379b96 SHA-256: 6aebbe5f24ef5c89bfd435ffe75b2dc54e1de14e871839b4e36bdf7f100d60fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the malicious redirector URL.

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=one+piece+android+wallpapers+hd
    • http://files.wanderingwander.com/uploads/1/3/1/6/131606951/44ddea22b9209.pdf
    • http://jovib.district619.com/uploads/1/3/0/7/130775364/2378524.pdf
    • http://files.qbmusichub.com/uploads/1/3/1/4/131453821/fisew.pdf
    • http://files.laarmyexplorers.org/uploads/1/3/1/8/131856569/9864316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/25185885588.pdf
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/76612872407.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/levusamenosajuvaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2929/files/awards_current_affairs_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/sesejisapusadijedotugure.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/jalshamoviez_bengali_movie.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/maidenform_shapewear_tank_top.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/zajegetevonilirowego.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/guided_fishing_trips_in_oklahoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/rorepedidodasiguruma.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b5.bin
41f57f2ddc6b80b31f134f35fb80e4e35bc84599c6f32f9362ef6e711e48f1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 5280 bytes
font_01_sfnt_off000076ad.bin
010c620dfe384bc39cd76ecf63371e3190991c74ebda3536df134b8009921b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AD 10204 bytes