Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b472d2e293f2e3…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 01:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0dba392c4e9923019996012f5d01237 SHA-1: f998648dea48f4f652ae8654743615997be8430d SHA-256: 57b472d2e293f2e3839eff4db4585aafdba227603a40e6ce3f0a45bd4a7c262d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.com/pify?keyword=little+alchemy+guide+from+start'. This link is part of a link farm designed to improve search engine rankings, a common tactic for phishing and scam lures. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other benign-looking Shopify URLs, likely intended to add legitimacy.

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/pify?keyword=little+alchemy+guide+from+start
    • http://files.muscogeerea.com/uploads/1/3/2/7/132740905/9778883.pdf
    • http://files.incendiamotus.ca/uploads/1/3/1/4/131437149/bepij.pdf
    • http://mimotir.bunsandbites.com/uploads/1/3/0/9/130969352/rojalusuvizebe.pdf
    • http://files.caribbeanmemoryproject.com/uploads/1/3/1/8/131856318/nilajofuvuxubixu.pdf
    • http://files.sleepygfarm.ca/uploads/1/3/1/1/131164009/remexitinufifubo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/55811585044.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/volume_of_rectangular_prisms_worksheets_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3283/8298/files/42078214225.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/41120469732.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/how_to_change_font_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0435/6984/0283/files/31999493586.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/80648116967.pdf
    • https://cdn.shopify.com/s/files/1/0436/0041/2835/files/10827558973.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/33493485408.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/tipos_de_anomalias_cromosomicas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5324/files/xefokavasada.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/xugijakilebijirevozoxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/gezuwekimeja.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_off000078b8.bin
16c79b74bd1683f2fc0f3a0bccece5dc46726f0845d3c972fcbe4e4ad2f70d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 5476 bytes
font_01_sfnt_off00008b39.bin
59dd257dffe981e31f52d53f26732f0d9e566957ed68eda32f2571d690cc04e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 9868 bytes

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