Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4d139260602f0b…

MALICIOUS

PDF

36.8 KB Created: 2020-08-04 02:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2985ef5529a23ab76fd1353f70ae4c3 SHA-1: 6fd44d2a379934240ec8291684edfddab0a5e9ed SHA-256: 1f4d139260602f0b5a8dd8f5915925606aad99e866f9f21da522d92cf2463e3b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure for 'bread recipes pdf free download'. The primary malicious URL identified is https://ttraff.com/pify?keyword=bread+recipes+pdf+free+download, which likely leads to further malicious content. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=bread+recipes+pdf+free+download
    • http://files.friendsofraymondjames.org/uploads/1/3/1/4/131437515/3447622.pdf
    • http://files.fitcoresmartmoves.com/uploads/1/3/1/3/131397983/3743306.pdf
    • http://files.northernlightsadaptations.com/uploads/1/3/2/6/132696414/b167a44960.pdf
    • http://files.upqha.net/uploads/1/3/2/6/132681516/f3ce55d666.pdf
    • http://files.genevaassemblyofgod.com/uploads/1/3/1/4/131413040/445cd7e0e5bb2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/28486848078.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/vujagopevixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/tofopaxixasivulorikifufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/32239742633.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/62206150984.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/99428571144.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/1696144457.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/kikixidujoxej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/8520227594.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/d-_link_dir-_655_manual.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_off0000483b.bin
d0268685ce78443ef8f47be5a4b35a6ecaf793c925ad15bd2bd2ff5a9944c71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x483B 3184 bytes
font_01_sfnt_off00005391.bin
6841dcf69515357df90746a150b568fc6f283b933ed662c351d7abaf30f30c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5391 5288 bytes
font_02_sfnt_off000065b1.bin
d6db51eb62e07c65954fff257e0950c61e1435d18f461871fc387123659b4962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B1 9376 bytes

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