Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f06a806a2b24b…

MALICIOUS

PDF

50.9 KB Created: 2020-08-29 19:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2880160384f9037814d48e06c7d9e471 SHA-1: f6d3d4c5b54f066e9507e02cfce926dba7a04c7d SHA-256: 828f06a806a2b24b4727329881046133243da8d6011a86735926b40d3527f484
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=goffman+la+presentaci%25C3%25B3n+de+la+person
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/0711/8233/files/avneet_kaur_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/dizekuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8349/files/mudaditemapukat.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/basic_electronics_engineering_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/blessed_assurance_third_day_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/38649859981.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/91972745871.pdf
    • https://cdn.shopify.com/s/files/1/0430/7582/9911/files/gaelic_name_pronunciation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/46567846918.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5953/files/mambo_number_5_disney.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3586/files/93773156532.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_off000086d2.bin
161c8aaf1bef67281c7e7a3e5c09f5f87367ec369155e95dcbf84a99bae51847
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D2 5468 bytes
font_01_sfnt_off00009912.bin
d3488b65e8a0dbd1156b6e75367a9ae5f6a4b655e832c3486640488cf644d139
pdf-font-stream PDF embedded font (sfnt) at offset 0x9912 10872 bytes