Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3664e9b033ceda…

MALICIOUS

PDF

44.2 KB Created: 2020-08-01 06:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6847ee142597d9ed83a218b71433cb00 SHA-1: ec59e46835e643ff813962ca2dce88c65dfcefc6 SHA-256: 7d3664e9b033cedab93198912754cf0c4813ab56568d4a3cad910492b0e9c46f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for distributing malware. The document body and embedded links suggest a lure for downloading files, potentially leading to a malicious payload. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.com/pify?keyword=digimon+masters+online+download
    • http://files.pianowithlisa.com/uploads/1/3/1/4/131406403/8421961.pdf
    • http://files.intoutuotni.com/uploads/1/3/0/7/130738614/rijepobavepawe.pdf
    • http://files.christinaedmondson.com/uploads/1/3/1/3/131397971/xususipabanasab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/7805/6091/files/45639626850.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/lokefixir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/jipiwineb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/bixepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/68397135961.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/39525387776.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/zatade.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/65900693183.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/27590272610.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/31728524644.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_off00006fc0.bin
422807dbd42bb30d310cf1226429b571acf86d19ebc3cadde50078fd9922543c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC0 5236 bytes
font_01_sfnt_off00008188.bin
1bb0db1b69291c0f5f1eafcfbc9509c96e068e44a9943093e34dd2108f803a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8188 10100 bytes

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