Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f33d9e452703e7e…

MALICIOUS

PDF

62.4 KB Created: 2020-08-16 20:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d63903bb5932dadcf04b621e4913f22 SHA-1: efbc62f8b60a5e9fdda6e41f62ca373032824b30 SHA-256: 6f33d9e452703e7e065220fe934692eb1bd10900e77b5abc6d7ba61051a5e5ac
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body and heuristics indicate an advance-fee scam lure, likely attempting to trick users into downloading further malicious content or visiting phishing sites. The presence of multiple external PDF links suggests a link farm used for SEO poisoning or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=adobe+acrobat+reader++10
    • http://makufi.rb-tactical.com/uploads/1/3/2/8/132814930/zemagijox-gozolodetali-xulake.pdf
    • http://files.meadowsterrehaute.com/uploads/1/3/1/8/131856173/reziratotud.pdf
    • http://files.centrestagedancestudios.com/uploads/1/3/1/1/131163747/xakawo.pdf
    • http://files.stringsforhope.com/uploads/1/3/1/6/131606546/wimisi_vogudabuv_tewelewuf_sanukodanoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0437/9567/7346/files/shielding_and_deshielding_effect_in_nmr_spectroscopy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tazoxusejeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46456123156.pdf
    • https://cdn.shopify.com/s/files/1/0447/3444/7770/files/java_config_files.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/synology_assistant_xpenology.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/96868999085.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/schizophrenia_nursing_diagnoses.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/60355638994.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e6e.bin
07953696a1d40fc423c14342313cbcb65eb5c3739189dadd9d7185c2a975d9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6E 5632 bytes
font_01_sfnt_off0000a1f7.bin
d51c53ee36605136ee5281135b990fb614f1fcd6dea20fb27bb0ab43d292f817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F7 5044 bytes
font_02_sfnt_off0000b32f.bin
77e56b85826eb02d524ff30b9bea2a3896113233599fd08a3327982c19f64dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 10584 bytes
font_03_sfnt_off0000d7a4.bin
ac177355b6614943054c4ed2a5eafcdd2a75510fb44b78c06357b7560844a6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 16064 bytes

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