Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cb99b691c0ccba…

MALICIOUS

PDF

40.0 KB Created: 2020-09-01 07:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e063afd12f95046256926e767de2927 SHA-1: f905a97b96aa3964b2b4e5249c55ad5264b26726 SHA-256: 10cb99b691c0ccbac86a15d9adecc7d00e2d36573a2dab350b7aaac3ae281f58
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=go+math+grade+3+homework+answers', which is also listed as a suspicious embedded URL. This suggests the document is designed to trick users into clicking the link, likely leading to a phishing or malware download 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.link/wix?keyword=go+math+grade+3+homework+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/binofogawew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/ministry_of_sound_radios.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/bevozelitewitulizeko.pdf
    • https://cdn.shopify.com/s/files/1/0458/1346/5254/files/mkwii_ctgp_revolution_download.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_e59822a349424e4493cd818eae24d2b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb1a0a638dc54fd3ba8de776b10e02fc.pdf
    • https://static.usrfiles.com/ugd/9d66c7_b3a8edace40a47c6a667da0da7e03da5.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/28464717254.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/52946325480.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/12302158916.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/47264926744.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca063486524e0cb3f99abcde058261.pdf
    • https://static.usrfiles.com/ugd/d775a9_db9de6b0b2cb4975b3bb4c3909ff8a50.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_off00005f5d.bin
b4d0ba929e96f8339b771991f7a2dbd57615e716e7f2aa106874fbd2be5c7289
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 5560 bytes
font_01_sfnt_off00007224.bin
97b182da6163e759e8c98d6beb54b8268ce12cb8931f169af539683277f02415
pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 9780 bytes