Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dc2dc693e958b2…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 16:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 526badc8ec90c50cc030ada4eb2eddb2 SHA-1: a30a9ca8b8f833b94432f9b8616b3689a47cc9cf SHA-256: 70dc2dc693e958b256ae6d5c7281aca9ce05deab6c0df38487c9edccffd7fa38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation. Crucially, it also contains a link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious.

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=artillery+crossword+answer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/astable_multivibrator_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/89354878949.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/grade_4_elapsed_time_word_problems_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/dainik_jagran_epaper_patna_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/xuferozovi.pdf
    • https://static.usrfiles.com/ugd/b8c837_62638afceee54a0e8e2ac5723e76ca92.pdf
    • https://static.usrfiles.com/ugd/a1fb72_af43822f763443f8810ba4feb82c7cee.pdf
    • https://static.usrfiles.com/ugd/45fd81_d2161d8b354c44d8b87018a5e2788459.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cc6f02fb8b14d88ac3c5a7bb30b2a08.pdf
    • https://static.usrfiles.com/ugd/b8c837_1063543c2d9b460a9568a7c07e9d1dca.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/57194712930.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/wagesasezumudot.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/16514797501.pdf
    • https://static.usrfiles.com/ugd/b8c837_affe1b30498c467f87c4f69187cf9570.pdf
    • https://static.usrfiles.com/ugd/735189_e0d9cd3a5d71472eb32dfd6752aa7d53.pdf
    • https://static.usrfiles.com/ugd/3d0627_545e3de97b674563ac68d1bce78974d7.pdf
    • https://static.usrfiles.com/ugd/c836c3_a76e991c09cd48838d5d2145817b2ec7.pdf
    • https://static.usrfiles.com/ugd/1decf9_fc4651ad38284eba97631b68eda0c418.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_off00007580.bin
741691213b6dad2ee8e87376db2013c108694047e4ac135f6ab725594e231fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 5116 bytes
font_01_sfnt_off0000870c.bin
6c71fe3ae7d65cefc3a253d68ab9af4365a949d649301c6a63def5114df153d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 10144 bytes

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