Malicious PDF — malware analysis report

Static analysis result for SHA-256 f439036d665a54f4…

MALICIOUS

PDF

41.9 KB Created: 2020-08-15 12:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ef01c16eda9eb2303049e5898a9bb0a SHA-1: cc7675fdb6cc3251c35b0ffa3c8e46bd06fe979c SHA-256: f439036d665a54f4d41a7df45d690b29e88721e45a857a153717832e9b6313d0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links that are part of a link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a Sagemcom router manual and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign hosting platforms. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=sagemcom%20f@st%205250%20manual
    • http://files.melrosespeech.com/uploads/1/3/2/3/132302780/sipudox.pdf
    • http://feruga.rayslicenseplates.com/uploads/1/3/0/8/130874277/e01880c47c9580.pdf
    • http://files.risingstarzmusic.com/uploads/1/3/2/6/132682790/zazekurijijanekorox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/zebugikixuxexudet.pdf
    • https://cdn.shopify.com/s/files/1/0451/1550/6853/files/action_bar_text_align_center_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/58313300396.pdf
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/xuxekidujakavakogomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/90338920413.pdf
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/dermatitis_atopik_usu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/94681399313.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/64152632913.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0669/files/13752127456.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/greystones_guide_la_touche.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/36809362345.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_off0000593e.bin
80a2a2652da4be0727ca3af31a0684d1463bc50449c45ba2fb9af8eff9147dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593E 5936 bytes
font_01_sfnt_off00006d66.bin
931d5046fabc80cffe54edee016e2a750a69910c05cb4d8a94817505473af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 14596 bytes

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