Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c42eabfcc9ca4e…

MALICIOUS

PDF

50.1 KB Created: 2020-07-17 21:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c5df6b444afc04f2e08ea55ad85c4b SHA-1: 1e590f4ab7146efc423813a2038e94e68ed47c82 SHA-256: 75c42eabfcc9ca4e02bb91a448bbf3d63fb69d14fafc4980e27b22fd88a5950d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for SEO spam or malware distribution.

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/wb?keyword=materi%20jaringan%20hewan%20pdf
    • http://files.azcrossstitch.com/uploads/1/3/2/6/132682655/37f9b687.pdf
    • http://files.sofiya-designer-portfolio.com/uploads/1/3/1/3/131380842/laritekuda.pdf
    • http://files.environmentnetwork.org/uploads/1/3/2/6/132681336/2531620.pdf
    • http://files.focusfitwithbritt.com/uploads/1/3/1/1/131163683/438c6c95871ce2.pdf
    • http://files.wlcbands.com/uploads/1/3/1/6/131607712/2769e0d94.pdf
    • http://files.labcharter-pto.com/uploads/1/3/1/3/131379434/4b32ad6.pdf
    • http://files.richgriendling.com/uploads/1/3/1/6/131606134/jobelexutedora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sekitojut.files.wordpress.com/2020/07/xumegademiwobumukubamum.pdf
    • https://kupasexale.files.wordpress.com/2020/06/75382073080.pdf
    • https://taloxufig.files.wordpress.com/2020/07/58991588492.pdf
    • https://lajosesofi.files.wordpress.com/2020/06/59844357701.pdf
    • https://lexopebevav.files.wordpress.com/2020/07/4138526505.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/figemetuvawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/33757542366.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/58525281927.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/26737947217.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/97711064570.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/47437966565.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.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_off000089a4.bin
cdcb1292ad6ceedbaddc07e816ab4851866b30959940403ff258326905a437f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 4944 bytes
font_01_sfnt_off00009a7e.bin
6bed39b4c33785e9bea3f248e5a26780aa682fc864cce5a2923a3179d650b0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7E 9568 bytes

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