Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3ac2dc419e51e6…

MALICIOUS

PDF

65.9 KB Created: 2020-08-30 11:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7d6f5051c3071a9fbbbecab31e033e SHA-1: d3183fc364431b77a110eabcc5be7fb00fbbb06c SHA-256: 1d3ac2dc419e51e6ad34e6f998526cff259f1de765d87470fb7e5f6eb4e46bf9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/wix?keyword=antecedentes+de+la+desercion+escolar, which is likely used to lure users to a phishing or malware distribution site.

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.com/wix?keyword=antecedentes+de+la+desercion+escolar
    • https://static.usrfiles.com/ugd/b8c837_ad796a46abf149ef8058e49501923ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd2509dd60c8478d80cab159c50a1e43.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1945de8c2834e48916708e4aeb9e4e6.pdf
    • https://static.usrfiles.com/ugd/e6092c_1c439cb455554ae89ce557e7799fe008.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcc87629cb534cf2b9ec74ea4d011f03.pdf
    • https://static.usrfiles.com/ugd/3b7182_929748cf861144eb882ddbc0d5bb52c5.pdf
    • https://static.usrfiles.com/ugd/516793_5581f6f1403846b08c8340a195be5601.pdf
    • https://static.usrfiles.com/ugd/784815_ed897f3899014b6db334705f684a797c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd86df1d45b439bb0196b904063b124.pdf
    • https://static.usrfiles.com/ugd/de65f7_e7dd9065fd9641478ae6b5dc45f8328a.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/friendly_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4954/8966/files/zilafowimifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/jasoxozo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f2a.bin
a2b2f583ae3a43cc6b4b54b3b6b69932d02babd772a30b222f965f9093a7135d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2A 4712 bytes
font_01_sfnt_off0000af25.bin
5acbb9f930899584615b06da2b7db42051b3a515809e35d29b799333ce55d435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 11608 bytes
font_02_sfnt_off0000d4c7.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 16204 bytes
font_03_sfnt_off0000e9f4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 4324 bytes

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