Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f647e481ddec8be…

MALICIOUS

PDF

34.1 KB Created: 2020-08-10 17:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0276a5ff5b22a0dc1c8f98fed68d030 SHA-1: b2d2913b85d08362171a57967be06eee2439ca6f SHA-256: 5f647e481ddec8be90ce14c64a3b2f9c0ffc84e6763ef55215fb159fa80fdaf7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily corrupted, contains the malicious URL, reinforcing the lure.

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.cc/pify?keyword=alto+sax+jazz+solos+pdf
    • http://files.akshop08.com/uploads/1/3/2/8/132814030/toburowaronogag.pdf
    • http://files.belaccommunications.com/uploads/1/3/1/4/131437158/9955582.pdf
    • http://files.haydukenterprises.com/uploads/1/3/1/4/131454521/397a2f7a496a.pdf
    • http://files.suburbanbakes.co.uk/uploads/1/3/1/6/131606396/7925818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/vodewuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/22197902541.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0272/files/54216773078.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/88611407315.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/63049174939.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/precalculus_review_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/wopabevugesukowipewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1461/files/5345954957.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/pikerebemenomomag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/tumuwofojukofabef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/nitofaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/rival_crock_pot_smart_pot.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004710.bin
9cf3249c2a3ff5b61499d6ea614c3ff90cc68ea2196546acc22c909ee03c0360
pdf-font-stream PDF embedded font (sfnt) at offset 0x4710 5120 bytes
font_01_sfnt_off000058a5.bin
d7451bd78083696a699bc6e9c8dfc130bc4b1ac1386fc163bb6fb122452d2cad
pdf-font-stream PDF embedded font (sfnt) at offset 0x58A5 10220 bytes