Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc08508a5962ffb9…

MALICIOUS

PDF

46.1 KB Created: 2020-08-15 01:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7c27b46c05e956e290fdf31fc43969 SHA-1: 596631ea99cc1edbe45e3017bcb5605e6bb3cf16 SHA-256: dc08508a5962ffb9a7f1ebe79e06bd1d16d09cb5927dc7703f35fdd3bee58072
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body text, though partially corrupted, includes the phrase "2020 calendar psd template", suggesting a lure to attract users to click on the malicious links. The ML classifier also 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.ru/pify?keyword=2020+calendar+psd+template
    • http://files.innovationsdanceplatform.co.uk/uploads/1/3/2/8/132814589/putadovej-vuxuzi.pdf
    • http://files.citizensmedicare.org/uploads/1/3/1/8/131872017/bb67b37e13386.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/rikixobazijuzisuvakojub.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/96028244332.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/jinolutilodukidolugoro.pdf
    • https://cdn.shopify.com/s/files/1/0445/8813/8660/files/materi_akuntansi_sebagai_sistem_informasi.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/ghazi_book_by_abu_shuja_abu_waqar.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/articles_on_financial_ratio_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/90496827196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/66845445017.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000768e.bin
e97488bdfe2640d0f115d46f70b519deaa5bfdb2925868753e1b8ef491dbe57e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 5396 bytes
font_01_sfnt_off000088b9.bin
6b9310f14f122b249139ca55d4d10f71524afd3d69b7632b4365128e244e728f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B9 10188 bytes

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