Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ecfd7e50f4bece…

MALICIOUS

PDF

45.9 KB Created: 2020-08-14 01:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3f00ec0bb7b33b5056e7bd8bd63372 SHA-1: 52e554367d87e45e490c0df5e7d62eb7cde8d4a2 SHA-256: 65ecfd7e50f4bece2083ed04ff7ff04b4ca17bc41cde77c721dccb3f68e05ca2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also hosts a large number of external PDF links, many of which point to benign content, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated 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=letter+sound+activity+sheet
    • http://files.michellevaske.com/uploads/1/3/1/3/131384468/e0a6ec.pdf
    • http://files.ricklewisrealestate.com/uploads/1/3/0/7/130776478/50365a373be3e3.pdf
    • http://files.morristem.com/uploads/1/3/1/4/131437822/121f8c28a8.pdf
    • http://files.juniperdesignmn.com/uploads/1/3/1/4/131454106/741516b65.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/carrabba_s_italian_grill_menu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/brand_equity_research.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/armani_underwear_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8529/files/54277398859.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/batata_doce_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/because_the_beatles_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/21752880856.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/10222982085.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/nopavatewuzigowakaxugojo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/3630356261.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/panchatantra_stories_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/62029203370.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/33080625628.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/sokoxasuvewini.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/55316133016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5c.bin
1421d6d0f239b591f826c97781329db5f7877b42d1ae22cdc531f3291e79d917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 5100 bytes
font_01_sfnt_off00007db2.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 1800 bytes
font_02_sfnt_off00008642.bin
7f7e4e3dbd36dbc8995301cd7837991ab96fdf8f85cb6838dfe1b06056bbe42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 10368 bytes

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