Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b394bbfbc38a1b2…

MALICIOUS

PDF

45.9 KB Created: 2020-08-18 13:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf955dd99bae32cda19246e0926a7cd SHA-1: 667ea11a6323765f2c0e82e9defdc6a8e674a547 SHA-256: 4b394bbfbc38a1b20fddf954468a274395df83706c9863bb463996c2b4722cd4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com and a malicious redirector at ttraff.ru. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or exploits.

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=active+listening+3+book+pdf
    • http://files.tatyanabyreferral.com/uploads/1/3/1/4/131437378/5520308.pdf
    • http://files.paolospazzini.com/uploads/1/3/0/7/130775331/vowinavivogugisanu.pdf
    • http://files.daffodilacres.com/uploads/1/3/0/7/130740017/c7b3ac346d6579.pdf
    • http://farogipa.mg-aviationphotography.com/uploads/1/3/2/8/132814930/44fc8a4ce7.pdf
    • http://files.cascadiangroup.info/uploads/1/3/0/7/130739353/06ed4020d89ad4.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/wogupesudeji.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/d3._js_heat_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/steam_download_speed.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/algebra_practice_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3978/5111/files/zalot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/attrape_coeur_salinger.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/justification_by_faith.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/laptop_me_file_kaise_banaye.pdf
    • https://cdn.shopify.com/s/files/1/0440/8662/4406/files/19771175249.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/materialismo_and_idealismo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/lubajemux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/53777468452.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/33119284776.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007492.bin
f1f2a045dda22cd41fbecb08c71d0727e09183a1abdb80213375cdc73a827211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7492 5432 bytes
font_01_sfnt_off00008721.bin
ad64d64a31bd822c786071850989f4cb4ca4a4554d4151ba5f81ef14f6720393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8721 10420 bytes

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