Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a3b9535569b8ef…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 22:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80a77d39b6bb56f39d0591ae2cd72810 SHA-1: a6d68f1500913474e7a9176787dc31c778b81ba9 SHA-256: 07a3b9535569b8ef062509b277f61a03a8eafb79937195db4d2d5a0eddc80ceb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a free download, which is a common social engineering tactic to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, and the embedded link points to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a harmful destination.

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/wix?keyword=pilu+tere+nile+nile+song+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_58698c06fa6840518f5369d122e9ed50.pdf
    • https://static.usrfiles.com/ugd/4826f5_a029e3fccf9041379e6358d7be39d77a.pdf
    • https://static.usrfiles.com/ugd/fac845_0f0fcc0bd6f54520a2dbcfb60f6303a4.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/21925659086.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/scorched_earth_2018_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/69286660883.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/battle_net_launcher_slow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1277/files/naruto_minecraft_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/4132/5207/files/mahindra_tractor_parts_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9855/5043/files/68791067323.pdf
    • https://cdn.shopify.com/s/files/1/0440/2393/9237/files/98983120097.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/64026758295.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/zagelozaxifimukijod.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/android_room_database_livedata_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/mastering_chemistry_chapter_11_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/android_tv_para_raspberry_pi_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/14905209899.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb0.bin
4024a6d5e541225d47f8e64f5eaefc4e8fd36f65fe3eb632bc28515339944149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB0 5168 bytes
font_01_sfnt_off0000705c.bin
2f6467e3a414adcff758c7788e9efea4794175608f83c21cee4fcfe9f1accf4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 13100 bytes

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