Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbeb2fdf2f2516e…

MALICIOUS

PDF

37.2 KB Created: 2020-09-04 20:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d246c7c899ab645e95ccc0eb88220037 SHA-1: 4b1d943feaaeb9b469ca0b1b26ba614b669b7fe1 SHA-256: dcbeb2fdf2f2516e41ae2fc17bfe1e61ba489b8c7cedd78d9174ec056deb0dd5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a redirector link to 'https://ttraff.link/wix?keyword=ge+dinamap+carescape+v100+manual', indicating a malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=ge+dinamap+carescape+v100+manual
    • https://static.usrfiles.com/ugd/b28ae2_c9ffe8194ae64be5bcbe96d3c0ae32cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b795ef5f06474cda8c10d76bfa098e23.pdf
    • https://static.usrfiles.com/ugd/fb83f1_085b639f26bd4df28117ef035bea2ea4.pdf
    • https://static.usrfiles.com/ugd/fbccce_c17eab7a2ed94b66ac223bdf163e8420.pdf
    • https://static.usrfiles.com/ugd/f523c3_752406a9146d42b89c6837dc5255c18a.pdf
    • https://cdn.shopify.com/s/files/1/0440/3239/3366/files/mystic_messenger_party_guests_correct_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3975/files/cheat_hungry_shark_evolution_android_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/widedetufizukovewerox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/dupuvuvufiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/nudasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6065/files/information_about_punctuation_marks_in_kannada_language.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/ludujev.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/kenmore_elite_refrigerator_service_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000548d.bin
5d8673eb2879208a6d74b20c3c9df29b092c113dd2f8a93b4c6d6f8ad4130c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x548D 5504 bytes
font_01_sfnt_off0000673e.bin
5d6459b041f2c6e85acdd8081f817b10279038418284fb07a0662faecee7cdde
pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 9696 bytes