Malicious PDF — malware analysis report

Static analysis result for SHA-256 7250b86ac69ff4fa…

MALICIOUS

PDF

52.4 KB Created: 2020-08-29 17:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ec007d8e1b903c07729cf9c177babb2 SHA-1: 18e07bcacaeebcd98a0a10bb2b61dd9bbfb9cd58 SHA-256: 7250b86ac69ff4fa594446318662b044ae9159bbb03a7c62ce47945bffd0bc5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'Chinese zodiac 2019 travel guide' and the malicious URL, suggesting a lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=chinese+zodiac+2019+travel+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fae4bc71b46c44b0aae9655d242d7e39.pdf
    • https://static.usrfiles.com/ugd/50c35f_eaf470b5c9794bc1badc1924d88bad16.pdf
    • https://static.usrfiles.com/ugd/b8c837_8417fa4b33b741ca9dab5101dfc5ddc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bfebc709e5845bd8b2ee6b7734eef6b.pdf
    • https://static.usrfiles.com/ugd/d2751c_8c60b5d0b9e140c799b02f0fe5e2a412.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/zototaxudubida.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b631993c6244b6d967a658805543a77.pdf
    • https://static.usrfiles.com/ugd/a91264_153e406d76c44c1792e8b46c7c011884.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/pakemidotivukepilofu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3204/1889/files/cartoon_me_free_online_no.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e8e.bin
ccd9423a99d38dfdbee2c573297a9100205b69b14c7ec3aec134381c9f32e88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 5696 bytes
font_01_sfnt_off0000a1f7.bin
effdeb11b039dfc4209e13b1026426924b3a4eed3d44585d01b1ac019ffa8b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F7 10280 bytes

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