Malicious PDF — malware analysis report

Static analysis result for SHA-256 c679f07870a13c1a…

MALICIOUS

PDF

44.5 KB Created: 2020-11-02 03:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5af6441c52169396a642500a42a30d77 SHA-1: 1dd12dc7646828282d8439c2406ce8bb22fc297f SHA-256: c679f07870a13c1af3042f6eb73d3ae190200377fc5de90d8e2a15f09b813574
94 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is an answer key, which is a common lure for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=glencoe+algebra+2+chapter+6+answer+key
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/6736822.pdf
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/ledemafo.pdf
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/valen-wiludulirabug-gomar.pdf
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/77c0fb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/minecraft_14_skin.pdf
    • https://s3.amazonaws.com/tadovu/investigacion_cuantitativa_en_psicologia_clark_carter.pdf
    • https://uploads.strikinglycdn.com/files/63446539-ec69-4b80-b820-8a76d2d19cc1/29322356154.pdf
    • https://uploads.strikinglycdn.com/files/b6869a1f-85de-4bab-8c09-813c4adf7dab/vaniladitoxebejidi.pdf
    • https://uploads.strikinglycdn.com/files/7b6d24cf-6cca-48fd-b2b6-f7a83d5f5540/gamabomemomesuvoteti.pdf
    • https://uploads.strikinglycdn.com/files/c45e7703-7eaa-424b-b4ca-b357f16172a2/40280042139.pdf
    • https://s3.amazonaws.com/zuxadol/82730969963.pdf
    • https://uploads.strikinglycdn.com/files/56cc903e-82c0-423b-8cf1-5b7949a60fce/73135288510.pdf
    • https://uploads.strikinglycdn.com/files/5c6bc23d-bbbc-4385-9034-23fdca4c112f/42223491808.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_off00005ca7.bin
f8cc1c171d0d65e91736850c0fba7cf4ce5c71d04d5c111a42693b0eac9774c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA7 5648 bytes
font_01_sfnt_off00006fe9.bin
25c1f7e5cbbdb26069748fdd14dc08c1ffd69d9b75a530d7947463acc741d260
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 11536 bytes
font_02_sfnt_off000096e6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x96E6 4324 bytes