Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73faa2b80e2c9d5…

MALICIOUS

PDF

42.2 KB Created: 2020-09-16 20:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257aead7a305965f7252e20f9f797985 SHA-1: 7adc4ce8bdc1c0b7fc1e38bc3a233bc96a5922a4 SHA-256: b73faa2b80e2c9d5345c57ab7ce4969a1c1d6f6e29453839c148650dc09f754c
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm designed to manipulate SEO. One critical heuristic identified a link to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive link farm and redirector suggest a phishing or SEO poisoning attack.

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.club/wix?keyword=postknight+boss+guide
    • http://files.brunogoeseverywhere.com/uploads/1/3/1/3/131381640/ropejofozakomon.pdf
    • http://zukad.sschifa.org/uploads/1/3/0/7/130739351/nefapuzob-rukilebodeb.pdf
    • http://files.berksonrealty.com/uploads/1/3/1/8/131872298/4928203.pdf
    • http://kenatovi.akbarilab.com/uploads/1/3/0/7/130740368/gunol_daxijofuwezan_kezawawizuj.pdf
    • https://2f43549b-6937-4928-a031-b111e0e243b9.filesusr.com/ugd/a2ebd8_812c2c6b528e4e9591100a3171501ee1.pdf?index=true
    • https://b1578003-f9a8-4f4a-a79e-92e87671fe3f.filesusr.com/ugd/d5cf39_193317edb896418fbe91c50b83aa7bd3.pdf?index=true
    • https://9b560097-fda6-46e1-aec5-ac5457a730e6.filesusr.com/ugd/4cd51e_35f04ccdd7484e7da77a176d16b1953a.pdf?index=true
    • https://56dfe3a5-7991-4500-9cb9-619f8490ec83.filesusr.com/ugd/ee9d3f_22523f565c664e33952b1e419f7941b5.pdf?index=true
    • https://956fb326-03b1-4eb1-a2a3-c6a03e929304.filesusr.com/ugd/3bcfef_7844f3dc2e664024b3336ef4856bf6c1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/medea_jean_anouilh.pdf
    • https://cdn.shopify.com/s/files/1/0440/0896/4246/files/89568390504.pdf
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/rexorogejolonapiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/59480029954.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/jigarineporunawabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/44861429317.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/fibebosu.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_off00006934.bin
1633b433a6597f6355ab718d11b6b6592599dfdd679a79e50b480bb11da4e4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6934 4956 bytes
font_01_sfnt_off00007a0f.bin
5f1541350a51bea56d9192f739d4fa651cf2e8a61dd19141d8dab381d2944b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0F 10028 bytes

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