Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac69806a5a209d…

MALICIOUS

PDF

67.8 KB Created: 2020-08-10 15:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6821d697ef742cf702eb5f62d818c9 SHA-1: 003bd0f33e48a2be3ae041d76f9a1c4632ee8c82 SHA-256: 25ac69806a5a209d76706dc3b73e04490937dbdc349bce751328a8db51d9844a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The embedded URL `https://ttraff.ru/pify?keyword=new+cutting+edge+intermediate+student+s+book+answer+key+pdf` is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary goal is to redirect the user to potentially harmful content.

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=new+cutting+edge+intermediate+student+s+book+answer+key+pdf
    • http://tipaf.aikidoandjudolifeschools.com/uploads/1/3/1/8/131856772/gapuluwezugo.pdf
    • http://jujukug.islandervillas.com/uploads/1/3/0/8/130814328/zegaxa.pdf
    • http://tibig.townofharmony.org/uploads/1/3/2/6/132695569/wugagemuvuleba-zulatobuxip-nazafem.pdf
    • http://files.speckmath.net/uploads/1/3/1/4/131437666/daxomixolosotenon.pdf
    • https://cdn.shopify.com/s/files/1/0449/6611/7544/files/administrative_management_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/disable_tv_plus_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0440/0067/3950/files/acs_inorganic_chemistry_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/povetuxegiwipuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/11351127942.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/sujet_et_corrig_brevet_franais_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/bodidofaramafumoji.pdf
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/slippin_dmx_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/61050654551.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/chemistry_book_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/74292913500.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/dorivapowebagagarejulivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/bhagavad_gita_book_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5462/files/famafoxafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/zozozetowafer.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_off0000c587.bin
26100da9b0c86d52920f3969b9115e99c85f987c30e7e597618936604bcdbd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 5808 bytes
font_01_sfnt_off0000d950.bin
32918d2cdc1bf1ef1ff6feef26e489dcbba9cc3133d06fbce20e4848b354dff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 12364 bytes

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