Malicious PDF — malware analysis report

Static analysis result for SHA-256 b377f2de120fe1ec…

MALICIOUS

PDF

53.8 KB Created: 2020-08-07 15:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da340cca3afcbcfe23aeecf603652632 SHA-1: 310d735f995c7b8d3c3e02fca3df29a754cec0fe SHA-256: b377f2de120fe1ec127f329f14db2ae88c6bdb2018a5dc0e56dd95e4c6ad7f15
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to obscure a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=important+days+in+pdf+tamil, which is linked from a collection of other URLs hosted on cdn.shopify.com and other domains. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the intent to redirect users to 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.cc/pify?keyword=important+days+in+pdf+tamil
    • http://files.asimpleido.com/uploads/1/3/0/9/130969185/nisupoluzojovo_lidorujowof.pdf
    • http://files.app-recipt.com/uploads/1/3/1/6/131637797/duxetojiwika_jitan_nolez.pdf
    • http://tinalekok.cilscpa.org/uploads/1/3/0/7/130740069/rafinuposaxo_kogibenoberuka_kedusifolivej.pdf
    • http://dufosi.artcebu.com/uploads/1/3/1/6/131607163/xiredadux-viguditedis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/vazex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/zokakibutogexag.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/lebudeliwefiloliraku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/32158293210.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/jokiwikusotunewuran.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/31349786726.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/27352032299.pdf
    • https://cdn.shopify.com/s/files/1/0437/6929/9101/files/aha_bls_provider_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25781613666.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/46091943646.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/59919341194.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/lomekira.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/77152681447.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000720e.bin
0bf3a620e8552ef36be58a9895238cffa9986b8dab52d1c892f2c49133fe312e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 4896 bytes
font_01_sfnt_off00008285.bin
235ccedb28b1dafe95c5fbc615b229a1abd43de5f1935143c74181ec9ab916b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8285 7548 bytes
font_02_sfnt_off00009754.bin
6bab0d3c1df246db35c9504bfec794521e2d0138a388f8164c05f76a020909b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9754 10644 bytes
font_03_sfnt_off0000bb8b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 4324 bytes

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