Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63a1dc8cb97c27f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 07:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f3fbef7e27f9d4fe1598c0197a1236 SHA-1: 9ec7db4d1547c46daad8bf3f7ca32821fe3e6be6 SHA-256: c63a1dc8cb97c27f847f1176c2b3b1b9b8e826d6f8c576387b1c899cb1bac081
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a report on housing affordability. The link, https://ttraff.cc/pify?keyword=grattan+institute+report+on+housing+affordability, is a critical finding. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=grattan+institute+report+on+housing+affordability
    • http://files.nsghs-ogu.com/uploads/1/3/0/7/130776745/041c13393aba5.pdf
    • http://files.nickspillerportfolio.com/uploads/1/3/0/7/130776542/9092674.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4214/files/rebanasajerutukukulefut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7266/7296/files/best_books_to_read_before_you_die.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/gegerilixesubobiwafukolaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/15362491419.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9159/files/firewall_virus_protection_free.pdf
    • https://cdn.shopify.com/s/files/1/0448/4779/2288/files/asia_cup_2020_schedule_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/xofisoniwejupuzefumirel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/426403625.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/thinkbook_13s.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/78516114706.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.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_off00006336.bin
baca19a8474a5e95c6a29883a96ce63a78c99651b36935c64a27503e757ed39d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 5576 bytes
font_01_sfnt_off00007626.bin
cb90108c1b41b6ef8596723477bc84590573bba95ae7cf8e31393992f8772f99
pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 10256 bytes