Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7fac5ecc2cb6a1…

MALICIOUS

PDF

56.6 KB Created: 2020-08-07 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf00e1d7c5a405120dbd8fa69624920a SHA-1: 7362fa911def1de0b502c5c977342aaf4c6d930b SHA-256: ff7fac5ecc2cb6a177803d8a89a22a5da5aafe1fd2f796c32e69d7b638e19272
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a large number of external links, a technique often used to create link farms for SEO manipulation or to host malicious content. One of the primary links points to a known malicious redirector, ttraff.com, which is designed to obscure the final destination and potentially deliver malware or phishing pages. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

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/pify?keyword=centrifuge+machine+function+pdf
    • http://pukuli.spiritwickcandleco.com/uploads/1/3/0/7/130739835/822241.pdf
    • http://files.amotivatinglove.org/uploads/1/3/1/3/131379252/puvujagenibid.pdf
    • http://files.farnhamloveyoga.com/uploads/1/3/2/7/132710679/xituzinobulunaguvik.pdf
    • http://files.dandowneymd.com/uploads/1/3/0/7/130776120/bcace9b4af.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/pojapinaseriledefevafofes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/670831270.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/vefuwuworawukevizeboxaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/78384860058.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/28118977085.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/mugajatuwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/gotup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/numerical_methods_chapra_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/kavesasuleteripokoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/falanit.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/13089582812.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7269/files/days_of_week_flashcards.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_off0000904f.bin
d7e77ebb61561242bc29d2e0c24a18d70ad9a798ff3faa6a23ee6f95f9371cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904F 5264 bytes
font_01_sfnt_off0000a203.bin
57e148fd893a89d8570fef59a377c63ef69cccf10c8c05e0612751ee6fc81f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA203 10836 bytes
font_02_sfnt_off0000c710.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 4324 bytes

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