Malicious PDF — malware analysis report

Static analysis result for SHA-256 885fd8f36012fb26…

MALICIOUS

PDF

50.8 KB Created: 2020-08-14 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cddaef273aa840782cf957b90a3ba2ff SHA-1: 90b16324cbe0f9a986b2aa97fd4ff06eda3cab4e SHA-256: 885fd8f36012fb26248e488bb9360dcbeb18e1117685aa86929d02b30d4deccf
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 pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates the document is designed as a link farm to distribute malicious content. 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.ru/pify?keyword=algorithme+exercice+et+solution+pdf
    • http://files.irchstheatre.org/uploads/1/3/0/8/130814714/7900484.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/hexadecimal_color_codes.pdf
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/dotapot.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/b_com_books_in_gujarati_medium.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/52617156308.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/discord_isn_t_detecting_my_mic.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/futata.pdf
    • https://cdn.shopify.com/s/files/1/0447/0652/9434/files/sepagosebenenipibulapiku.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/fususuxasifedimisate.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/90489830339.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/foluvup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0387/0375/files/arnold_ehret_mucusless_diet_healing_system.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/telaxozuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/iambic_pentameter_examples.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/74875400878.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bfa.bin
84ca169893e78c49dedaf7d6d848cc3bc48b49cf73ef0e09e7d1148ab2610ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 5300 bytes
font_01_sfnt_off00007de3.bin
42b466df045016ce223f7216866128650756e1455e97e8c72449aee54840e700
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE3 16140 bytes
font_02_sfnt_off0000aff4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 4324 bytes