Malicious PDF — malware analysis report

Static analysis result for SHA-256 87285c93f0086f26…

MALICIOUS

PDF

45.0 KB Created: 2020-08-24 14:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf66b5a27c3909515f5c319f93cf165a SHA-1: 0cdbbc1ec57aec5d18c49a97cb4887a6d0db10eb SHA-256: 87285c93f0086f26c6e2894d0fb727ea1d59712651bb1d1d260bad1a25a26280
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 a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting an attempt to drive traffic to malicious sites.

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=workforce+diversity+meaning+pdf
    • http://files.suleamath.org/uploads/1/3/0/7/130740573/toxegiz_balulugof_zemokotigab_guzaletoma.pdf
    • http://peras.thissiteisunderconstruction.org/uploads/1/3/2/8/132815114/vufasifovugu-dapemizojulaj-kobenit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/mutuwitaxitanixu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/969741522.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6819160869.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/63424249553.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/wulerime.pdf
    • https://cdn.shopify.com/s/files/1/0462/6006/0309/files/xekuzaxinimajawozid.pdf
    • https://cdn.shopify.com/s/files/1/0450/1500/7390/files/cracked_android_phone_screen_repair.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/xizekewewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/vefore.pdf
    • https://cdn.shopify.com/s/files/1/0461/0555/9203/files/51592200872.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/durable_power_of_attorney_form_tennessee_free.pdf
    • https://cdn.shopify.com/s/files/1/0451/0554/5369/files/wibud.pdf
    • https://cdn.shopify.com/s/files/1/0440/5837/8392/files/manual_de_campana_extractora_sole.pdf
    • https://cdn.shopify.com/s/files/1/0464/4896/7848/files/fixinipupipijixa.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_off00006f00.bin
da41049059f9e5f17ac4f0d3b8458214479caeb363acd45cc81460b586051805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F00 5684 bytes
font_01_sfnt_off0000825b.bin
bc1f090ee5b6d4429a2f358cd1d18751aa4c67e19bd8791dd109eef040e0c11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 10804 bytes

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