Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b38734aa101625…

MALICIOUS

PDF

51.2 KB Created: 2020-08-21 21:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 092ad11b8bd2f49e330745c10557a52f SHA-1: a4b0c1741df28ccb14a97f4db6c64c5a4c64eca5 SHA-256: 50b38734aa1016256233b908b836bdf95225b4bddd379447d89ba0859a0dae37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=discrete+probability+distribution+questions+and+answers+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the 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/pify?keyword=discrete+probability+distribution+questions+and+answers+pdf In PDF document text
    • http://files.crearanch.com/uploads/1/3/1/4/131407647/8196800.pdfIn PDF document text
    • http://files.awake-mysoul.com/uploads/1/3/2/6/132695830/doxeponafajikonexu.pdfIn PDF document text
    • http://files.albertaorff.ca/uploads/1/3/1/4/131409090/jimovi.pdfIn PDF document text
    • http://lajopijel.urbanmoosetd.com/uploads/1/3/1/3/131383544/wexabelov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/brexit_latest_news.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/80891399904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/3382/4154/files/23935729588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/73722539328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/nukod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/brachi_o_medical_term.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/58072849337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3767/0041/files/91341799200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/fixujudobinovomejoredogin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/cricket_bowling_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6857/0265/files/48586638807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/71856889630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3703/8494/files/34967860552.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8A 5488 bytes
SHA-256: 94a665d9a5165bed53c51e396a911560cd37e6e628c48e03cfe97141f79c87e6
font_01_sfnt_off00007e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 15372 bytes
SHA-256: b4521cede4fc797a8013004e4b25674da152d0ab926b4298e91ce3cf62f2b791
font_02_sfnt_off0000aed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.