Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f7b27976a0bc7f…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 21:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f476f1cf78430ad3c239a741bd6494c SHA-1: 4935af600f2f3e91f38775b200854257d0036842 SHA-256: 65f7b27976a0bc7fac78f7be47c610ad052d7853b41025b4ce8dd2d4d173b11b
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for academic references. The presence of a large number of external PDF links further suggests a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=referencias+bibliograficas+apa+sexta+edicion+pdf
    • http://rolemu.drumcondratriangle.com/uploads/1/3/1/3/131383657/8fed5fcb7fb66e.pdf
    • http://files.jonathankilhams.com/uploads/1/3/2/6/132695258/c69de4524b0.pdf
    • http://files.touchdayspa.net/uploads/1/3/1/4/131453917/fipejikoxi.pdf
    • http://files.spokenred.net/uploads/1/3/1/4/131406036/8789865.pdf
    • http://files.planetstompers.net/uploads/1/3/0/8/130814279/jafumabe_kuvevot_zufatinuwinoxi_tizax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/mafukiruwumubazafeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/tivojululiviki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/72975450636.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/14641606137.pdf
    • https://cdn.shopify.com/s/files/1/0436/9216/3227/files/32885771289.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/cambridge_academic_english_intermediate_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/binotizonimurizuvumuso.pdf
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/jefedoviroduripudokoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/98251406424.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/zusur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/53446720987.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/acquired_aplastic_anemia.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_off00006ef8.bin
4ee12abc973eccd7648053394ca139816081124fed16eaaa5ae46f90bacb242b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF8 5536 bytes
font_01_sfnt_off000081e3.bin
5fdbfaee7ae36462f7ce863339ac855051b9762ef33b8743a192407ccdcf7def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 11012 bytes

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