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) First seen: 2020-09-07
MD5: 37c5df6b444afc04f2e08ea55ad85c4b SHA-1: 1e590f4ab7146efc423813a2038e94e68ed47c82 SHA-256: 75c42eabfcc9ca4e02bb91a448bbf3d63fb69d14fafc4980e27b22fd88a5950d
194 Risk Score

Malware Insights

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

The PDF contains a large number of links to external resources, many of which are hosted on domains designed to appear as legitimate file-sharing services. The primary redirector URL, https://ttraff.ru/wb?keyword=materi%20jaringan%20hewan%20pdf, is flagged as malicious, indicating a likely phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.azcrossstitch.com/uploads/1/3/2/6/132682655/37f9b687.pdfIn PDF document text
    • http://files.sofiya-designer-portfolio.com/uploads/1/3/1/3/131380842/laritekuda.pdfIn PDF document text
    • http://files.environmentnetwork.org/uploads/1/3/2/6/132681336/2531620.pdfIn PDF document text
    • http://files.focusfitwithbritt.com/uploads/1/3/1/1/131163683/438c6c95871ce2.pdfIn PDF document text
    • http://files.wlcbands.com/uploads/1/3/1/6/131607712/2769e0d94.pdfIn PDF document text
    • http://files.labcharter-pto.com/uploads/1/3/1/3/131379434/4b32ad6.pdfIn PDF document text
    • http://files.richgriendling.com/uploads/1/3/1/6/131606134/jobelexutedora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sekitojut.files.wordpress.com/2020/07/xumegademiwobumukubamum.pdfIn PDF document text
    • https://kupasexale.files.wordpress.com/2020/06/75382073080.pdfIn PDF document text
    • https://taloxufig.files.wordpress.com/2020/07/58991588492.pdfIn PDF document text
    • https://lajosesofi.files.wordpress.com/2020/06/59844357701.pdfIn PDF document text
    • https://lexopebevav.files.wordpress.com/2020/07/4138526505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/figemetuvawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/33757542366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/58525281927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/26737947217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/97711064570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/47437966565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 4944 bytes
SHA-256: cdcb1292ad6ceedbaddc07e816ab4851866b30959940403ff258326905a437f2
font_01_sfnt_off00009a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7E 9568 bytes
SHA-256: 6bed39b4c33785e9bea3f248e5a26780aa682fc864cce5a2923a3179d650b0b4