Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e5ec66515cc2ff…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 06:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d57c5d4dd2069fddcc08d1b4fe8ff8 SHA-1: a15550435b49cfb69c12f7c5f5feb3dd3bca57a8 SHA-256: 88e5ec66515cc2ff1ba7f57cc64eceeda83082bc67185fe93bbf3f07106e3238
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to a known malicious redirector. Additionally, it features a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse. The primary malicious IOC is the redirector URL, which is likely used to direct users to a malicious site.

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.com/wix?keyword=crownwood+consulting+ltd
    • https://cdn.shopify.com/s/files/1/0436/5906/7557/files/zogaganugafozoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0189/6347/files/blending_in_morphology.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/guwopukesava.pdf
    • https://cdn.shopify.com/s/files/1/0454/5445/9030/files/rimamepujofidabilok.pdf
    • https://cdn.shopify.com/s/files/1/0460/3379/7279/files/33486850032.pdf
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/fonegaluvipuvivavupipu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/koliguregipa.pdf
    • https://cdn.shopify.com/s/files/1/0441/0497/4488/files/adosphere_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/libros_de_reiki_kundalini.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/53731812354.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/senusovegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/letidexulewatogaxadimom.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/44958385327.pdf
    • https://cdn.shopify.com/s/files/1/0465/4746/8446/files/33781044001.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d2.bin
2c67a5053c3eb1409ce5be6155cbbbafe5bbff448bfde4f2e25ff2ab8d8bcf2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 4896 bytes
font_01_sfnt_off00007392.bin
25edf6f929b7d09ff0dd9afffdf7ffb616a93127bfeccefa720c7b2e0ebd4ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7392 13900 bytes