Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7b984148c5fe04…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 14:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a4c04adbd73275f7be9904c688c3fe5 SHA-1: a3d856c7212aae95f53a298a606adc7ab0183bf0 SHA-256: 8d7b984148c5fe04e600f0e4df368a68c6d69b38270abf7a997d7ded69f1d203
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to 'Ayurvedic plants information in marathi pdf'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=ayurvedic+plants+information+in+marathi+pdf
    • https://cdn.shopify.com/s/files/1/0437/8974/6337/files/xoxekujomesiweges.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/memotod.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/chinese_character_writing_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/68557461571.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/9e53d4_65520baa465d4507ae2cc0e772fca29f.pdf
    • https://static.usrfiles.com/ugd/b8c837_881cf17a5c4749aba71450fa4b908378.pdf
    • https://static.usrfiles.com/ugd/89363e_d337be4407714730bd000d17088a8093.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/mipawuzibirofadefowewex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/retowepafugukajarewofe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/nidosiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/vowuweramegiz.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_off000056dc.bin
ea8c697573e4f46bfda3272f35b5932a72c932d9512f34708c9d1d5d236f74aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x56DC 5428 bytes
font_01_sfnt_off00006928.bin
bd360e20a956b88fb427f056930459110725335610a39b6c4c9734fb4dd04979
pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 10620 bytes
font_02_sfnt_off00008d30.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D30 4324 bytes