Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2686f6c8498c559…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 12:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbbdb5ea61e1101dc0256601e59000f0 SHA-1: 30e525aa4f1c977c97a76da56711a889b5e5e4ad SHA-256: c2686f6c8498c5590714e8ba6a808424c7ba3b986092727b208d7630bcff49ef
152 Risk Score

Malware Insights

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

The PDF contains embedded links and text that mimic a legitimate software updater, specifically for Samsung products. The primary malicious URL, 'https://ttraff.cc/pify?keyword=samsung+software+updater+for+pc+free', is identified as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links pointing to various PDF files, some of which are hosted on Shopify. The ML classifier strongly indicates maliciousness.

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=samsung+software+updater+for+pc+free
    • http://maxuxaxu.theunbrokenbody.com/uploads/1/3/1/4/131408027/7463539.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/80883276740.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/61166225584.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/wabakol.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/texte_des_accords_d_evian.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/volobuponej.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/vukoxiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6844/0224/files/jawbone_bluetooth_headphones_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/bromoform_limit_in_drinking_water.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudusojixidotivage.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_off00005c1a.bin
538aeeeccb1572a256223fcb8514bfd52be2a8e0ac626b3a9b46be582c1cfb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5640 bytes
font_01_sfnt_off00006f44.bin
4fa10ea943f6c1dd34b1e72129d4edc055546d426ab0962306679769d1166491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F44 10464 bytes

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