Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a489b059c25aa0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-22 20:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281d8970dda472e19eb3a4e6edd2aaca SHA-1: 48825135162e1a87cdca14b7de31be7773b73840 SHA-256: 83a489b059c25aa0e73080276387a96604afae1cfee3485b72c620649a6a8d39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified as a redirector. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a malicious redirector link.

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=android+one+wallpapers+hd
    • http://files.acorncookies.com/uploads/1/3/1/1/131164442/samukelodabaz.pdf
    • http://xutilu.wightmantennis.org/uploads/1/3/0/8/130814328/8c79007f9f1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/7261510257.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/ncert_class_8_english_grammar_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2346/files/janobol.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/john_deere_111_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2325/files/beacon_theater_seating_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/ninogupavinuwepumulowuwuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/dejuvulejotofujoxedogina.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/jokewusakumoduvuxuwuxas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/saturated_hydrocarbons.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c29.bin
f85bd6de6278da535f4984e98bfc5623f4834ac2b96ec9b87081b0b7abd44fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C29 4836 bytes
font_01_sfnt_off00006c86.bin
0c188cfdbf2367d288a047108ebd47909072d7407babfd02df16a012a3e00b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 10060 bytes
font_02_sfnt_off00008ee7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE7 4324 bytes