Malicious PDF — malware analysis report

Static analysis result for SHA-256 262a9648a983c931…

MALICIOUS

PDF

48.5 KB Created: 2020-08-30 09:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ca295c508dac4fa363c457de26d69c SHA-1: b487cf7f9d28a41aa6562869476410e17ab48d57 SHA-256: 262a9648a983c93178001989812d1cb960d3bd4aa0fb0e5aa117a6d565b25ba0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=cooper+aba+book'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in phishing. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

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=cooper+aba+book
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/2765290202.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/rurisiwag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/73693279339.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/zujuvunexoge.pdf
    • https://cdn.shopify.com/s/files/1/0438/2221/9421/files/arabic_cartoon_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/cartoon_images_for_colouring.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/88870667220.pdf
    • https://static.usrfiles.com/ugd/79cb75_75031c85b84b476192445cfdefb70682.pdf
    • https://static.usrfiles.com/ugd/b8c837_e63eecc5c7444d6f96fb954dbe4207c7.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/22300613838.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/tax_challan_280_in_excel_format.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_off0000744a.bin
ea293d4e4e9089f030d3acf7cc968a956005cd5cd32eac2e42f1eb82714aee88
pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 4384 bytes
font_01_sfnt_off00008331.bin
8dc6c6726ad7ba0cf4899235de36f7579e79f5641d07cd5ad5ce8a7549795b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 10696 bytes
font_02_sfnt_off0000a751.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA751 4324 bytes