Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7425a95a5863fd…

MALICIOUS

PDF

38.1 KB Created: 2020-08-12 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22de23870cda7a0637ef15cf28243a8 SHA-1: cadb7058bfa206b25f9c31682e365c6fbbacafb5 SHA-256: da7425a95a5863fd5da047462cb8d4b420c6e2a3dafca7a5533ff2db4b866db5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to a redirector infrastructure, indicating a link farm or phishing lure. The primary malicious link identified is https://ttraff.cc/pify?keyword=schindler+s+list+cello+sheet+music+pdf, which is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains references to the same malicious URL and benign-looking PDF filenames, suggesting an attempt to disguise the malicious intent. No scripts were extracted, but the heuristic firings strongly indicate a redirection-based attack.

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=schindler+s+list+cello+sheet+music+pdf
    • http://files.writerwadekelly.com/uploads/1/3/1/1/131164386/durozojuxo-jevador-tofaxiluvuno.pdf
    • http://files.thealynnpaul.com/uploads/1/3/0/7/130738681/nulibo-gegow.pdf
    • http://files.plantdrpeter.com/uploads/1/3/1/1/131164052/lekiluzelirolupob.pdf
    • http://files.thenakeddogboutique.com/uploads/1/3/1/3/131380052/boritixuboxu.pdf
    • http://files.qtaxservices.com/uploads/1/3/1/3/131398532/weluwowodukifop_siwavazofamaw_meradojulige_tiwigesun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/arturia_audio_fuse_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/zijezepadifinekuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8890/4353/files/water_pollution_journal.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/51506051219.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/88218700125.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2417/files/25679772107.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/32578596868.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/bihar_tet_computer_science_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/ximotafesunoxuxubuxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a7e.bin
f94787cea0e8c55aa1cf913c1ab9a0dd37e3e6664c822dc66193dcc3e72902ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7E 5172 bytes
font_01_sfnt_off00005bd3.bin
b2516561a27f16eff54cfab6c1f55cfd6255bda87c1792693a2e183bbe37b7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD3 9668 bytes
font_02_sfnt_off00007d06.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D06 4324 bytes

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