Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3c8db5e5e598e3…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 07:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 447acf43ba38cae8e027cc79854af611 SHA-1: 31b939fe64d0d585543cbc05425069804f549d20 SHA-256: 5d3c8db5e5e598e3c16a13f44b7f9d2da1ee5b696ac9418ad0e4f95a00705342
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a deceptive title and numerous embedded links, including one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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=algorithms+dasgupta+solutions+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/farel.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/dejipovuveboxafuvabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/fumolizibirupa.pdf
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/56019667482.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/sivuzilanurelejemiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/gagezaxetej.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/2020_desi_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/6962100940.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5574/files/full_form_of_psccge_in_biology.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/22266213504.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/xenatipemezivesovogowewu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/80002280774.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7895/files/chicken_invaders_5_halloween_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/65641976725.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c3a.bin
e992503d69dcd4dab76e8f9cd90ab822e3a9fa5b985787af64d9e0160d581e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C3A 5208 bytes
font_01_sfnt_off00005dbd.bin
893f98167095b35a39fd5a9b3e82667061ec075e024940f103f2b5b64b758d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 10004 bytes
font_02_sfnt_off00007fe5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 4324 bytes

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