Malicious PDF — malware analysis report

Static analysis result for SHA-256 1090bffecc58aa14…

MALICIOUS

PDF

46.8 KB Created: 2020-08-14 03:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6de68c5439d4f64098be9b0d8610f453 SHA-1: b6e14188b9ff2364d44803fede2aef367f4e5bc4 SHA-256: 1090bffecc58aa146d814fe164ae32d325583fa8127871f4dc8d9e571a4b4ecf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URLs, 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=network+security+policy+template+pdf
    • http://files.westlakechoirs.org/uploads/1/3/1/3/131398380/terudekereb-rawojigik-remebazakifesa.pdf
    • http://konibibaw.alabamacivicchorale.com/uploads/1/3/1/4/131482975/mizikokowizuza.pdf
    • http://rilagi.aspectsofdance.ca/uploads/1/3/2/8/132815148/gemefe.pdf
    • http://files.abco-ca.com/uploads/1/3/1/1/131163867/bc86d5d.pdf
    • http://files.sttammanywoodworkersguild.com/uploads/1/3/0/7/130775370/zosemofusalugej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/cellule_de_crise.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/batman_the_killing_joke_1988.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/furibovowuto.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/xolumofer.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/82311556830.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/90568575225.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/92143805556.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/20869933088.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/balubopewazifidega.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/netogoxus.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/logs_fml_client_latest_log.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_off00007933.bin
822601a04f89e69c20f5cce7f391bb9b18d11501baae09353f0b33f6d44a64dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 5528 bytes
font_01_sfnt_off00008c0e.bin
9e64eaf9eff0b055eafe4014e9565ba02b195f4160cbf373aef3078a819a0d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0E 10052 bytes

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