Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f71fac3567f473…

MALICIOUS

PDF

46.0 KB Created: 2020-08-12 04:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19895514a2a835b2dfa0c76bd86652e2 SHA-1: 1b65f4a1b5081402d368aea841bf382fcd2c42e1 SHA-256: 05f71fac3567f4736867bcccf8b42ff0c989e5411b77ce730ce3fe6385554c4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=vegetation+adenoide+pdf', is flagged as a malicious redirector, indicating a phishing or malicious content delivery attempt. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=vegetation+adenoide+pdf
    • http://files.media-education-portal.com/uploads/1/3/1/0/131070173/vulewuvumo.pdf
    • http://files.magiqatlas.com/uploads/1/3/0/8/130814513/zivatemurijupizowigi.pdf
    • http://filarapot.publicgypsum.com/uploads/1/3/1/6/131606289/vorarurilodadubobibe.pdf
    • http://files.kaysewienekephotography.com/uploads/1/3/2/3/132303099/xibufisota-tetagudo-pezas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/diguloriwakifusajakanijak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/manofafivulidunimelepu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/va_form_21_0820.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/ielts_listening_recent_actual_tests_audio.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/vijulupiromi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/90265566119.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/kilikelotejorobuja.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/list_of_important_adventure_time_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/5327838031.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/zunutodiledewepib.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/simpletech_external_hard_drive.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_off00006c8e.bin
21054556d760ec31881584b75e77dff93c256296ae39e3cc213cf28674afdf2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 4868 bytes
font_01_sfnt_off00007d3c.bin
77560b8a6f247d3f3b15fd0e956bd4d32f999297b43e8765af6a587ce77b794c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 15528 bytes

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