Malicious PDF — malware analysis report

Static analysis result for SHA-256 c859778db31ec1d6…

MALICIOUS

PDF

44.6 KB Created: 2020-08-09 06:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2616eb5ec81b0ad3fdcb77846df920e0 SHA-1: ba4b8a58d2bbf1ede9a44ff1bf10b549cb5e204f SHA-256: c859778db31ec1d6c647e478772cb01a7bc1139fb8fab44e9d7f9ab01869316a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely used to obscure the malicious redirector. 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.cc/pify?keyword=french+bilingual+dictionary+pdf
    • http://files.pyroh.org/uploads/1/3/0/8/130813427/1b6d2d19d.pdf
    • http://files.gretnaumc.com/uploads/1/3/1/3/131378950/7104871.pdf
    • http://files.usfencinglongisland.com/uploads/1/3/0/9/130969079/f201579.pdf
    • http://files.braysbargainzzz.com/uploads/1/3/2/8/132814241/dunijubakosena.pdf
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/75625616839.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/xarufapupiraladilixa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/1988_ford_f350.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/93269121222.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1742/files/77812822168.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6429/files/la_batarde_d_istanbul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3650/files/89828039154.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/68686199020.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7949/files/fijobexijodavatirokuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/jepetuzavogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4861/files/tigafedepesumofon.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_off0000631c.bin
6863ab8b6e95977b2e5db7e960457b46f25e02f5e9d7f0de60f568f2ce5540cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 5320 bytes
font_01_sfnt_off0000752b.bin
798783f5077ff3cab3afdf929052f7056bf6f6859b4f61ce722fea9ee26c10ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752B 10060 bytes
font_02_sfnt_off0000979c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979C 4324 bytes

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