Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c325ec9cfb49c82…

MALICIOUS

PDF

51.4 KB Created: 2020-07-09 19:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e775ee8e6dca6df95efd83f5e9f4ff0e SHA-1: ef5faeaceafc4b0976028662f5697358fb2d719e SHA-256: 1c325ec9cfb49c82cd2cd9cf16af06691a1423ba34619a648f10cccd3f22da67
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One prominent link, 'https://ttraff.com/wb?keyword=appliance%20repair%20training%20manuals%20pdf', is identified as a malicious redirector. The document body, though partially obfuscated, contains text related to 'appliance repair training manuals pdf', suggesting a lure to trick users into clicking the malicious links. 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.com/wb?keyword=appliance%20repair%20training%20manuals%20pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.climatechheatingcooling.com/uploads/1/3/0/7/130776875/57020532409.pdf
    • http://files.redeemercityreykjavik.com/uploads/1/3/1/8/131856518/8582783.pdf
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdf
    • http://files.vcdssydney.com/uploads/1/3/0/8/130813770/gowasebuwupamekowa.pdf
    • http://files.outloudvideo.com/uploads/1/3/1/6/131606454/sotupumaj-newuxu.pdf
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://files.gold-condominium.com/uploads/1/3/2/6/132682639/vupesamije.pdf
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdf
    • https://gapigibodaj.files.wordpress.com/2020/06/80163885146.pdf
    • https://selijowo.files.wordpress.com/2020/06/74498619211.pdf
    • https://toxuluva830071386.files.wordpress.com/2020/06/regetozulipovuruzokamipin.pdf
    • https://jakuwil.files.wordpress.com/2020/07/51661294469.pdf
    • https://porawinag.files.wordpress.com/2020/06/bavabegetukufuvewofut.pdf
    • https://jimewiwujexo.files.wordpress.com/2020/07/33192351418.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazobezosajage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.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_off00008b28.bin
cdf115409e4c7dcf61bd82e71af316b93036661f235bbb2076a2969504239c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 5236 bytes
font_01_sfnt_off00009cd4.bin
505e891f8478ad582e9e4b94fa01b3e36c28fe613da270374bcda2f9b9d1dd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD4 10320 bytes

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