Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff340ce69e608e32…

MALICIOUS

PDF

41.4 KB Created: 2020-08-04 23:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f821ec60ca65b7f99bbc2b892e0894c SHA-1: cb3cb62854dfdb361d16dce6232772b17c87b963 SHA-256: ff340ce69e608e32e9f71ca0578a04c57107f34f7b72308a8d6b6bbf211dcbd0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file contains a large number of embedded links, many of which point to a redirector service or potentially malicious domains. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to external, potentially harmful, content. No scripts were extracted, limiting the analysis of direct payload execution.

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.ru/pify?keyword=comparison+of+adverbs+exercises+pdf
    • http://files.pdxmusicminister.com/uploads/1/3/0/7/130775221/9e8377a4f38d3.pdf
    • http://files.latvsff.org/uploads/1/3/1/3/131384432/melam-duxan-goxujororaku.pdf
    • http://files.parkcitybrewery.shop/uploads/1/3/1/3/131383982/zitiputeziwelib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/boss_rc-_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/gebixizelufepisoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/6929/3223/files/the_100_book_kass_morgan.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/download_video_from_m3u8.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/xejatipuzugefodomuja.pdf
    • https://cdn.shopify.com/s/files/1/0445/7309/8143/files/can_you_open_in_paint.pdf
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/check_if_file_exists_bash.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3057/files/89549214714.pdf
    • https://cdn.shopify.com/s/files/1/0439/1455/9656/files/55444946062.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/college_algebra_james_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/tasuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004da1.bin
16415e799aeade533b814cd82f2bda026593f500e16cda976c6fb8354aa4079f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA1 5444 bytes
font_01_sfnt_off00006009.bin
1e13c42c411b5021ef5617cccca1fc35be8c9dfc1a8ce689e15c8076c65262d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6009 9920 bytes
font_02_sfnt_off00008221.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8221 16060 bytes

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