Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc8889837056b34…

MALICIOUS

PDF

84.0 KB Created: 2020-08-31 13:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea835589743a9c73fc6c306094eb2f5 SHA-1: 73c8253f37e0addabce5a7e55a022cb5df818920 SHA-256: 2dc8889837056b34ce83f2333c7ce3b6d9dbe63bd3cea2fc3a0f6b752aac95c4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link to a known malicious redirector, ttraff.ru. It also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=aviation+alphabet+pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/antonio_pasquali_comprender_la_comunicacin.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/how_to_install_resource_packs.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/21983567556.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/wajaguju.pdf
    • https://static.usrfiles.com/ugd/469aea_c15384672b3c4ff692a086c6bffb29ff.pdf
    • https://static.usrfiles.com/ugd/73cb9e_2432a7488a894e3981eb2bc37f5c26e9.pdf
    • https://static.usrfiles.com/ugd/98857b_b9a952ec7f544ccbbd11cde3dcac3462.pdf
    • https://static.usrfiles.com/ugd/b28561_6a5c1175d99b4b81b8166b5d13ac5505.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a474de23234ad19ff6efe174bdf19a.pdf
    • https://static.usrfiles.com/ugd/724fb5_d689f35b1df94943a34d3f1d2f3c4209.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/gejerojopekam.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/79706461794.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/tijatogexegam.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_off0000dd25.bin
f04fd72641c2c3b4a9634542f1f4d675f4654e80b749d47ae3b34d8af5dfd99f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 5044 bytes
font_01_sfnt_off0000ee51.bin
7bd2bf868d156f4356f5617ea62cc40fcee669859a95f9b874da6878ada0655d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 20152 bytes
font_02_sfnt_off000128ee.bin
84ac4d264094f6d0ffc4037ae8f9573f493c8e1260d1e1ef5e06d71a736b1123
pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 17516 bytes