Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b503e8ab9b5b4a8…

MALICIOUS

PDF

48.0 KB Created: 2020-08-06 14:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e05ac018b84ccecfb1c01c4a62f34f SHA-1: dbf5eb15ec7832f58d6ab79144aefc9c97a190f0 SHA-256: 7b503e8ab9b5b4a8b35c04003ad1be74464292e1e58e41cfd0baf5e9028dd524
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. 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=building+construction+report+file+pdf
    • http://tiwetizob.lemonsqueezykb.co.uk/uploads/1/3/1/6/131606407/29258325495ff.pdf
    • http://pozut.myacousticlife.com/uploads/1/3/1/6/131606165/zuliduxevedixuwewu.pdf
    • http://duvivebil.fsofl.org/uploads/1/3/1/3/131398455/fanozeja.pdf
    • http://files.tellurianresearchpress.com.au/uploads/1/3/1/0/131071312/votexo_mutigotesaw.pdf
    • http://files.josephfinley.com/uploads/1/3/2/8/132814972/jigeteb_xuwixaz_kevafijalok_wodopup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/jepejimozuretetewokabisex.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/garax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/feperud.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/11041194177.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/5e_winged_tiefling.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/sebewikitumeroro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/jixuvabiwil.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0734/files/68774673069.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/pascal_s_triangle_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/jetuvebugipegudapow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/42682948527.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_off00007e64.bin
7286f1d66ba06b669a9b0ef7875e7714027c44231ac999fab1c1572e0c141805
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 5164 bytes
font_01_sfnt_off0000900d.bin
c4677245027f8f897f9c4413650b45f358dffc90c8716e58e0263be082137ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x900D 10140 bytes